/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: lbfgsb.c,v $
  Language:  C++
  Date:      $Date: 2005/02/21 20:16:24 $
  Version:   $Revision: 1.13 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/

/* This file contains code for Large-scale Bound-constrained or
 * Unconstrainted Optimization.
 *
 * The original fortan code was obtained from
 * http://www.ece.northwestern.edu/~nocedal/lbfgsb.html
 * and converted to c code using the f2c converted.
 * The resulting c file was then heavily modified in order
 * remove calls to output routines.
 *
 * Refer to the original webpage for condition of use.
 *
 * References:
 *
 * [1] R. H. Byrd, P. Lu and J. Nocedal.
 * A Limited Memory Algorithm for Bound Constrained Optimization, (1995),
 * SIAM Journal on Scientific and Statistical Computing ,
 * 16, 5, pp. 1190-1208.
 *
 * [2] C. Zhu, R. H. Byrd and J. Nocedal.
 * L-BFGS-B: Algorithm 778: L-BFGS-B, FORTRAN routines for large scale
 * bound constrained optimization (1997),
 * ACM Transactions on Mathematical Software,
 * Vol 23, Num. 4, pp. 550 - 560.
 *
 *
 */

#ifdef __BORLANDC__
/* A hack to overcome a typo in borlands math.h
 * file with respect to the abs function
 * line 206 of C:\Borland\Bcc55\include\math.h 
 * uses _RTLENTRYF instead of _RTLENTRY */
# define __ABS_DEFINED
# include <math.h>
# undef __ABS_DEFINED
#else
# include <math.h>
#endif
#include "f2c.h"
#include "netlib.h"

/* Table of constant values */

static doublereal c_b9 = 0.;
static integer c__1 = 1;
/* static integer c__9 = 9; */
static integer c__11 = 11;
/* static integer c__3 = 3; */
static doublereal c_b275 = .001;
static doublereal c_b276 = .9;
static doublereal c_b277 = .1;
/* static integer c__5 = 5; */
//Reordering function calls could prevent the need for defining these statics before use.
static int dtrsl_( doublereal *t, integer *ldt, integer *n, doublereal *b, integer *job, integer *info);
static int hpsolb_( integer *n, doublereal *t, integer *iorder, integer *iheap);
static int dcsrch_( doublereal *f, doublereal *g, doublereal *stp, doublereal *ftol,
    doublereal *gtol, doublereal *xtol, doublereal *stpmin, doublereal *stpmax,
    char *task, integer *isave, doublereal *dsave, ftnlen task_len);
static int dcstep_( doublereal *stx, doublereal *fx, doublereal *dx,
    doublereal *sty, doublereal *fy, doublereal *dy, doublereal *stp, doublereal *fp, doublereal *dp,
    logical *brackt, doublereal *stpmin, doublereal *stpmax);

/* Subroutine */
static int active_( integer *n, doublereal *l, doublereal *u, integer *nbd,
doublereal *x, integer *iwhere, integer *iprint,
logical *prjctd, logical *cnstnd, logical *boxed)
{
    /* Format strings */
/*
    static char fmt_1001[] = "(/,\002At X0 \002,i9,\002 variables are exactl\
y at the bounds\002)";
*/

    /* System generated locals */
    integer i__1;

    /* Local variables */
    static integer nbdd, i__;

    /* Fortran I/O blocks */
/*
    static cilist io___81 = { 0, 6, 0, 0, 0 };
    static cilist io___82 = { 0, 6, 0, 0, 0 };
    static cilist io___83 = { 0, 6, 0, fmt_1001, 0
*/


/*     ************ */

/*     Subroutine active */

/*     This subroutine initializes iwhere and projects the initial x to */
/*       the feasible set if necessary. */

/*     iwhere is an integer array of dimension n. */
/*       On entry iwhere is unspecified. */
/*       On exit iwhere(i)=-1  if x(i) has no bounds */
/*                         3   if l(i)=u(i) */
/*                         0   otherwise. */
/*       In cauchy, iwhere is given finer gradations. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
/*     Initialize nbdd, prjctd, cnstnd and boxed. */
    /* Parameter adjustments */
    --iwhere;
    --x;
    --nbd;
    --u;
    --l;

    /* Function Body */
    nbdd = 0;
    *prjctd = FALSE_;
    *cnstnd = FALSE_;
    *boxed = TRUE_;
/*     Project the initial x to the easible set if necessary. */
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
    if (nbd[i__] > 0) {
        if (nbd[i__] <= 2 && x[i__] <= l[i__]) {
        if (x[i__] < l[i__]) {
            *prjctd = TRUE_;
            x[i__] = l[i__];
        }
        ++nbdd;
        } else if (nbd[i__] >= 2 && x[i__] >= u[i__]) {
        if (x[i__] > u[i__]) {
            *prjctd = TRUE_;
            x[i__] = u[i__];
        }
        ++nbdd;
        }
    }
/* L10: */
    }
/*     Initialize iwhere and assign values to cnstnd and boxed. */
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
    if (nbd[i__] != 2) {
        *boxed = FALSE_;
    }
    if (nbd[i__] == 0) {
/*                                this variable is always free */
        iwhere[i__] = -1;
/*           otherwise set x(i)=mid(x(i), u(i), l(i)). */
    } else {
        *cnstnd = TRUE_;
        if (nbd[i__] == 2 && u[i__] - l[i__] <= 0.) {
/*                   this variable is always fixed */
        iwhere[i__] = 3;
        } else {
        iwhere[i__] = 0;
        }
    }
/* L20: */
    }
    if (*iprint >= 0) {
    if (*prjctd) {
/*
        s_wsle(&io___81);
        do_lio(&c__9, &c__1, "The initial X is infeasible.  Restart with\
 its projection.", (ftnlen)58);
        e_wsle();
*/
    }
    if (! (*cnstnd)) {
/*
        s_wsle(&io___82);
        do_lio(&c__9, &c__1, "This problem is unconstrained.", (ftnlen)30)
            ;
        e_wsle();
*/
    }
    }
    if (*iprint > 0) {
/*
    s_wsfe(&io___83);
    do_fio(&c__1, (char *)&nbdd, (ftnlen)sizeof(integer));
    e_wsfe();
*/
    }
    return 0;
} /* active_ */

/* ======================= The end of active ============================= */
/* Subroutine */
static int bmv_( integer *m, doublereal *sy, doublereal *wt,
integer *col, doublereal *v, doublereal *p, integer *info)
{
    /* System generated locals */
    integer sy_dim1, sy_offset, wt_dim1, wt_offset, i__1, i__2;

    /* Local variables */
    static integer i__, k;
    static integer i2;
    static doublereal sum;

/*     ************ */

/*     Subroutine bmv */

/*     This subroutine computes the product of the 2m x 2m middle matrix */
/*     in the compact L-BFGS formula of B and a 2m vector v; */
/*     it returns the product in p. */

/*     m is an integer variable. */
/*       On entry m is the maximum number of variable metric corrections */
/*         used to define the limited memory matrix. */
/*       On exit m is unchanged. */

/*     sy is a double precision array of dimension m x m. */
/*       On entry sy specifies the matrix S'Y. */
/*       On exit sy is unchanged. */

/*     wt is a double precision array of dimension m x m. */
/*       On entry wt specifies the upper triangular matrix J' which is */
/*         the Cholesky factor of (thetaS'S+LD^(-1)L'). */
/*       On exit wt is unchanged. */

/*     col is an integer variable. */
/*       On entry col specifies the number of s-vectors (or y-vectors) */
/*         stored in the compact L-BFGS formula. */
/*       On exit col is unchanged. */

/*     v is a double precision array of dimension 2col. */
/*       On entry v specifies vector v. */
/*       On exit v is unchanged. */

/*     p is a double precision array of dimension 2col. */
/*       On entry p is unspecified. */
/*       On exit p is the product Mv. */

/*     info is an integer variable. */
/*       On entry info is unspecified. */
/*       On exit info = 0       for normal return, */
/*                    = nonzero for abnormal return when the system */
/*                                to be solved by dtrsl is singular. */

/*     Subprograms called: */

/*       Linpack ... dtrsl. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    wt_dim1 = *m;
    wt_offset = 1 + wt_dim1 * 1;
    wt -= wt_offset;
    sy_dim1 = *m;
    sy_offset = 1 + sy_dim1 * 1;
    sy -= sy_offset;
    --p;
    --v;

    /* Function Body */
    if (*col == 0) {
    return 0;
    }
/*     PART I: solve [  D^(1/2)      O ] [ p1 ] = [ v1 ] */
/*                   [ -L*D^(-1/2)   J ] [ p2 ]   [ v2 ]. */
/*     solve Jp2=v2+LD^(-1)v1. */
    p[*col + 1] = v[*col + 1];
    i__1 = *col;
    for (i__ = 2; i__ <= i__1; ++i__) {
    i2 = *col + i__;
    sum = 0.;
    i__2 = i__ - 1;
    for (k = 1; k <= i__2; ++k) {
        sum += sy[i__ + k * sy_dim1] * v[k] / sy[k + k * sy_dim1];
/* L10: */
    }
    p[i2] = v[i2] + sum;
/* L20: */
    }
/*     Solve the triangular system */
    dtrsl_(&wt[wt_offset], m, col, &p[*col + 1], &c__11, info);
    if (*info != 0) {
    return 0;
    }
/*         solve D^(1/2)p1=v1. */
    i__1 = *col;
    for (i__ = 1; i__ <= i__1; ++i__) {
    p[i__] = v[i__] / sqrt(sy[i__ + i__ * sy_dim1]);
/* L30: */
    }
/*     PART II: solve [ -D^(1/2)   D^(-1/2)*L'  ] [ p1 ] = [ p1 ] */
/*                    [  0         J'           ] [ p2 ]   [ p2 ]. */
/*       solve J^Tp2=p2. */
    dtrsl_(&wt[wt_offset], m, col, &p[*col + 1], &c__1, info);
    if (*info != 0) {
    return 0;
    }
/*       compute p1=-D^(-1/2)(p1-D^(-1/2)L'p2) */
/*                 =-D^(-1/2)p1+D^(-1)L'p2. */
    i__1 = *col;
    for (i__ = 1; i__ <= i__1; ++i__) {
    p[i__] = -p[i__] / sqrt(sy[i__ + i__ * sy_dim1]);
/* L40: */
    }
    i__1 = *col;
    for (i__ = 1; i__ <= i__1; ++i__) {
    sum = 0.;
    i__2 = *col;
    for (k = i__ + 1; k <= i__2; ++k) {
        sum += sy[k + i__ * sy_dim1] * p[*col + k] / sy[i__ + i__ *
            sy_dim1];
/* L50: */
    }
    p[i__] += sum;
/* L60: */
    }
    return 0;
} /* bmv_ */

/* ======================== The end of bmv =============================== */
/* Subroutine */
static int cauchy_(
integer *n, doublereal *x, doublereal *l, doublereal *u, integer *nbd,
doublereal *g, integer *iorder, integer *iwhere, doublereal *t,
doublereal *d__, doublereal *xcp, integer *m, doublereal *wy, doublereal *ws,
doublereal *sy, doublereal *wt, doublereal *theta, integer *col, integer *head,
doublereal *p, doublereal *c__, doublereal *wbp, doublereal *v, integer *nint,
doublereal *sg, doublereal *yg, integer *iprint, doublereal *sbgnrm,
integer *info, doublereal *epsmch)
{
    /* Format strings */
/*
    static char fmt_3010[] = "(/,\002---------------- CAUCHY entered--------\
-----------\002)";
    static char fmt_1010[] = "(\002Cauchy X =  \002,/,(4x,1p,6(1x,d11.4)))";
    static char fmt_4011[] = "(/,\002Piece    \002,i3,\002 --f1, f2 at start\
 point \002,1p,2(1x,d11.4))";
    static char fmt_5010[] = "(\002Distance to the next break point =  \002,\
1p,d11.4)";
    static char fmt_6010[] = "(\002Distance to the stationary point =  \002,\
1p,d11.4)";
    static char fmt_4010[] = "(\002Piece    \002,i3,\002 --f1, f2 at start p\
oint \002,1p,2(1x,d11.4))";
    static char fmt_2010[] = "(/,\002---------------- exit CAUCHY-----------\
-----------\002,/)";
*/

    /* System generated locals */
    integer wy_dim1, wy_offset, ws_dim1, ws_offset, sy_dim1, sy_offset,
        wt_dim1, wt_offset, i__1, i__2;
    doublereal d__1;

    /* Local variables */
    static doublereal dibp;
    static integer iter;
    static doublereal zibp, tsum, dibp2;
    static integer i__, j;
    static logical bnded;
    static doublereal neggi;
    static integer nfree;
    static doublereal bkmin;
    static integer nleft;
    static doublereal f1, f2, f2_org__, dt, tj, tl;
    static integer nbreak, ibkmin;
    static doublereal tu;
    static integer pointr;
    static doublereal tj0;
    static logical xlower, xupper;
    static integer ibp;
    static doublereal dtm;
    static doublereal wmc, wmp, wmw;
    static integer col2;

    /* Fortran I/O blocks */
/*
    static cilist io___88 = { 0, 6, 0, 0, 0 };
    static cilist io___96 = { 0, 6, 0, fmt_3010, 0 };
    static cilist io___105 = { 0, 6, 0, fmt_1010, 0 };
    static cilist io___110 = { 0, 6, 0, 0, 0 };
    static cilist io___117 = { 0, 6, 0, fmt_4011, 0 };
    static cilist io___118 = { 0, 6, 0, fmt_5010, 0 };
    static cilist io___119 = { 0, 6, 0, fmt_6010, 0 };
    static cilist io___122 = { 0, 6, 0, 0, 0 };
    static cilist io___127 = { 0, 6, 0, 0, 0 };
    static cilist io___128 = { 0, 6, 0, 0, 0 };
    static cilist io___129 = { 0, 6, 0, fmt_4010, 0 };
    static cilist io___130 = { 0, 6, 0, fmt_6010, 0 };
    static cilist io___131 = { 0, 6, 0, fmt_1010, 0 };
    static cilist io___132 = { 0, 6, 0, fmt_2010, 0 };
*/


/*     ************ */

/*     Subroutine cauchy */

/*     For given x, l, u, g (with sbgnrm > 0), and a limited memory */
/*       BFGS matrix B defined in terms of matrices WY, WS, WT, and */
/*       scalars head, col, and theta, this subroutine computes the */
/*       generalized Cauchy point (GCP), defined as the first local */
/*       minimizer of the quadratic */

/*                  Q(x + s) = g's + 1/2 s'Bs */

/*       along the projected gradient direction P(x-tg,l,u). */
/*       The routine returns the GCP in xcp. */

/*     n is an integer variable. */
/*       On entry n is the dimension of the problem. */
/*       On exit n is unchanged. */

/*     x is a double precision array of dimension n. */
/*       On entry x is the starting point for the GCP computation. */
/*       On exit x is unchanged. */

/*     l is a double precision array of dimension n. */
/*       On entry l is the lower bound of x. */
/*       On exit l is unchanged. */

/*     u is a double precision array of dimension n. */
/*       On entry u is the upper bound of x. */
/*       On exit u is unchanged. */

/*     nbd is an integer array of dimension n. */
/*       On entry nbd represents the type of bounds imposed on the */
/*         variables, and must be specified as follows: */
/*         nbd(i)=0 if x(i) is unbounded, */
/*                1 if x(i) has only a lower bound, */
/*                2 if x(i) has both lower and upper bounds, and */
/*                3 if x(i) has only an upper bound. */
/*       On exit nbd is unchanged. */

/*     g is a double precision array of dimension n. */
/*       On entry g is the gradient of f(x).  g must be a nonzero vector. */
/*       On exit g is unchanged. */

/*     iorder is an integer working array of dimension n. */
/*       iorder will be used to store the breakpoints in the piecewise */
/*       linear path and free variables encountered. On exit, */
/*         iorder(1),...,iorder(nleft) are indices of breakpoints */
/*                                which have not been encountered; */
/*         iorder(nleft+1),...,iorder(nbreak) are indices of */
/*                                     encountered breakpoints; and */
/*         iorder(nfree),...,iorder(n) are indices of variables which */
/*                 have no bound constraits along the search direction. */

/*     iwhere is an integer array of dimension n. */
/*       On entry iwhere indicates only the permanently fixed (iwhere=3) */
/*       or free (iwhere= -1) components of x. */
/*       On exit iwhere records the status of the current x variables. */
/*       iwhere(i)=-3  if x(i) is free and has bounds, but is not moved */
/*                 0   if x(i) is free and has bounds, and is moved */
/*                 1   if x(i) is fixed at l(i), and l(i) .ne. u(i) */
/*                 2   if x(i) is fixed at u(i), and u(i) .ne. l(i) */
/*                 3   if x(i) is always fixed, i.e.,  u(i)=x(i)=l(i) */
/*                 -1  if x(i) is always free, i.e., it has no bounds. */

/*     t is a double precision working array of dimension n. */
/*       t will be used to store the break points. */

/*     d is a double precision array of dimension n used to store */
/*       the Cauchy direction P(x-tg)-x. */

/*     xcp is a double precision array of dimension n used to return the */
/*       GCP on exit. */

/*     m is an integer variable. */
/*       On entry m is the maximum number of variable metric corrections */
/*         used to define the limited memory matrix. */
/*       On exit m is unchanged. */

/*     ws, wy, sy, and wt are double precision arrays. */
/*       On entry they store information that defines the */
/*                             limited memory BFGS matrix: */
/*         ws(n,m) stores S, a set of s-vectors; */
/*         wy(n,m) stores Y, a set of y-vectors; */
/*         sy(m,m) stores S'Y; */
/*         wt(m,m) stores the */
/*                 Cholesky factorization of (theta*S'S+LD^(-1)L'). */
/*       On exit these arrays are unchanged. */

/*     theta is a double precision variable. */
/*       On entry theta is the scaling factor specifying B_0 = theta I. */
/*       On exit theta is unchanged. */

/*     col is an integer variable. */
/*       On entry col is the actual number of variable metric */
/*         corrections stored so far. */
/*       On exit col is unchanged. */

/*     head is an integer variable. */
/*       On entry head is the location of the first s-vector (or y-vector) */
/*         in S (or Y). */
/*       On exit col is unchanged. */

/*     p is a double precision working array of dimension 2m. */
/*       p will be used to store the vector p = W^(T)d. */

/*     c is a double precision working array of dimension 2m. */
/*       c will be used to store the vector c = W^(T)(xcp-x). */

/*     wbp is a double precision working array of dimension 2m. */
/*       wbp will be used to store the row of W corresponding */
/*         to a breakpoint. */

/*     v is a double precision working array of dimension 2m. */

/*     nint is an integer variable. */
/*       On exit nint records the number of quadratic segments explored */
/*         in searching for the GCP. */

/*     sg and yg are double precision arrays of dimension m. */
/*       On entry sg  and yg store S'g and Y'g correspondingly. */
/*       On exit they are unchanged. */

/*     iprint is an INTEGER variable that must be set by the user. */
/*       It controls the frequency and type of output generated: */
/*        iprint<0    no output is generated; */
/*        iprint=0    print only one line at the last iteration; */
/*        0<iprint<99 print also f and |proj g| every iprint iterations; */
/*        iprint=99   print details of every iteration except n-vectors; */
/*        iprint=100  print also the changes of active set and final x; */
/*        iprint>100  print details of every iteration including x and g; */
/*       When iprint > 0, the file iterate.dat will be created to */
/*                        summarize the iteration. */

/*     sbgnrm is a double precision variable. */
/*       On entry sbgnrm is the norm of the projected gradient at x. */
/*       On exit sbgnrm is unchanged. */

/*     info is an integer variable. */
/*       On entry info is 0. */
/*       On exit info = 0       for normal return, */
/*                    = nonzero for abnormal return when the the system */
/*                              used in routine bmv is singular. */

/*     Subprograms called: */

/*       L-BFGS-B Library ... hpsolb, bmv. */

/*       Linpack ... dscal dcopy, daxpy. */


/*     References: */

/*       [1] R. H. Byrd, P. Lu, J. Nocedal and C. Zhu, ``A limited */
/*       memory algorithm for bound constrained optimization'', */
/*       SIAM J. Scientific Computing 16 (1995), no. 5, pp. 1190--1208. */

/*       [2] C. Zhu, R.H. Byrd, P. Lu, J. Nocedal, ``L-BFGS-B: FORTRAN */
/*       Subroutines for Large Scale Bound Constrained Optimization'' */
/*       Tech. Report, NAM-11, EECS Department, Northwestern University, */
/*       1994. */

/*       (Postscript files of these papers are available via anonymous */
/*        ftp to eecs.nwu.edu in the directory pub/lbfgs/lbfgs_bcm.) */

/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
/*     Check the status of the variables, reset iwhere(i) if necessary; */
/*       compute the Cauchy direction d and the breakpoints t; initialize */
/*       the derivative f1 and the vector p = W'd (for theta = 1). */
    /* Parameter adjustments */
    --xcp;
    --d__;
    --t;
    --iwhere;
    --iorder;
    --g;
    --nbd;
    --u;
    --l;
    --x;
    --yg;
    --sg;
    --v;
    --wbp;
    --c__;
    --p;
    wt_dim1 = *m;
    wt_offset = 1 + wt_dim1 * 1;
    wt -= wt_offset;
    sy_dim1 = *m;
    sy_offset = 1 + sy_dim1 * 1;
    sy -= sy_offset;
    ws_dim1 = *n;
    ws_offset = 1 + ws_dim1 * 1;
    ws -= ws_offset;
    wy_dim1 = *n;
    wy_offset = 1 + wy_dim1 * 1;
    wy -= wy_offset;

    /* Function Body */
    if (*sbgnrm <= 0.) {
    if (*iprint >= 0) {
/*
        s_wsle(&io___88);
        do_lio(&c__9, &c__1, "Subgnorm = 0.  GCP = X.", (ftnlen)23);
        e_wsle();
*/
    }
    dcopy_(n, &x[1], &c__1, &xcp[1], &c__1);
    return 0;
    }
    bnded = TRUE_;
    nfree = *n + 1;
    nbreak = 0;
    ibkmin = 0;
    bkmin = 0.;
    col2 = *col << 1;
    f1 = 0.;
    if (*iprint >= 99) {
/*
    s_wsfe(&io___96);
    e_wsfe();
*/
    }
/*     We set p to zero and build it up as we determine d. */
    i__1 = col2;
    for (i__ = 1; i__ <= i__1; ++i__) {
    p[i__] = 0.;
/* L20: */
    }
/*     In the following loop we determine for each variable its bound */
/*        status and its breakpoint, and update p accordingly. */
/*        Smallest breakpoint is identified. */
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
    neggi = -g[i__];
    if (iwhere[i__] != 3 && iwhere[i__] != -1) {
/*             if x(i) is not a constant and has bounds, */
/*             compute the difference between x(i) and its bounds. */
        if (nbd[i__] <= 2) {
        tl = x[i__] - l[i__];
        }
        if (nbd[i__] >= 2) {
        tu = u[i__] - x[i__];
        }
/*           If a variable is close enough to a bound */
/*             we treat it as at bound. */
        xlower = nbd[i__] <= 2 && tl <= 0.;
        xupper = nbd[i__] >= 2 && tu <= 0.;
/*              reset iwhere(i). */
        iwhere[i__] = 0;
        if (xlower) {
        if (neggi <= 0.) {
            iwhere[i__] = 1;
        }
        } else if (xupper) {
        if (neggi >= 0.) {
            iwhere[i__] = 2;
        }
        } else {
        if (abs(neggi) <= 0.) {
            iwhere[i__] = -3;
        }
        }
    }
    pointr = *head;
    if (iwhere[i__] != 0 && iwhere[i__] != -1) {
        d__[i__] = 0.;
    } else {
        d__[i__] = neggi;
        f1 -= neggi * neggi;
/*             calculate p := p - W'e_i* (g_i). */
        i__2 = *col;
        for (j = 1; j <= i__2; ++j) {
        p[j] += wy[i__ + pointr * wy_dim1] * neggi;
        p[*col + j] += ws[i__ + pointr * ws_dim1] * neggi;
        pointr = pointr % *m + 1;
/* L40: */
        }
        if (nbd[i__] <= 2 && nbd[i__] != 0 && neggi < 0.) {
/*                                 x(i) + d(i) is bounded; compute t(i). */
        ++nbreak;
        iorder[nbreak] = i__;
        t[nbreak] = tl / (-neggi);
        if (nbreak == 1 || t[nbreak] < bkmin) {
            bkmin = t[nbreak];
            ibkmin = nbreak;
        }
        } else if (nbd[i__] >= 2 && neggi > 0.) {
/*                                 x(i) + d(i) is bounded; compute t(i). */
        ++nbreak;
        iorder[nbreak] = i__;
        t[nbreak] = tu / neggi;
        if (nbreak == 1 || t[nbreak] < bkmin) {
            bkmin = t[nbreak];
            ibkmin = nbreak;
        }
        } else {
/*                x(i) + d(i) is not bounded. */
        --nfree;
        iorder[nfree] = i__;
        if (abs(neggi) > 0.) {
            bnded = FALSE_;
        }
        }
    }
/* L50: */
    }
/*     The indices of the nonzero components of d are now stored */
/*       in iorder(1),...,iorder(nbreak) and iorder(nfree),...,iorder(n). */
/*       The smallest of the nbreak breakpoints is in t(ibkmin)=bkmin. */
    if (*theta != 1.) {
/*                   complete the initialization of p for theta not= one. */
    dscal_(col, theta, &p[*col + 1], &c__1);
    }
/*     Initialize GCP xcp = x. */
    dcopy_(n, &x[1], &c__1, &xcp[1], &c__1);
    if (nbreak == 0 && nfree == *n + 1) {
/*                  is a zero vector, return with the initial xcp as GCP. */
    if (*iprint > 100) {
/*
        s_wsfe(&io___105);
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
        do_fio(&c__1, (char *)&xcp[i__], (ftnlen)sizeof(doublereal));
        }
        e_wsfe();
*/
    }
    return 0;
    }
/*     Initialize c = W'(xcp - x) = 0. */
    i__1 = col2;
    for (j = 1; j <= i__1; ++j) {
    c__[j] = 0.;
/* L60: */
    }
/*     Initialize derivative f2. */
    f2 = -(*theta) * f1;
    f2_org__ = f2;
    if (*col > 0) {
    bmv_(m, &sy[sy_offset], &wt[wt_offset], col, &p[1], &v[1], info);
    if (*info != 0) {
        return 0;
    }
    f2 -= ddot_(&col2, &v[1], &c__1, &p[1], &c__1);
    }
    dtm = -f1 / f2;
    tsum = 0.;
    *nint = 1;
    if (*iprint >= 99) {
/*
    s_wsle(&io___110);
    do_lio(&c__9, &c__1, "There are ", (ftnlen)10);
    do_lio(&c__3, &c__1, (char *)&nbreak, (ftnlen)sizeof(integer));
    do_lio(&c__9, &c__1, "  breakpoints ", (ftnlen)14);
    e_wsle();
*/
    }
/*     If there are no breakpoints, locate the GCP and return. */
    if (nbreak == 0) {
    goto L888;
    }
    nleft = nbreak;
    iter = 1;
    tj = 0.;
/* ------------------- the beginning of the loop ------------------------- */
L777:
/*     Find the next smallest breakpoint; */
/*       compute dt = t(nleft) - t(nleft + 1). */
    tj0 = tj;
    if (iter == 1) {
/*         Since we already have the smallest breakpoint we need not do */
/*         heapsort yet. Often only one breakpoint is used and the */
/*         cost of heapsort is avoided. */
    tj = bkmin;
    ibp = iorder[ibkmin];
    } else {
    if (iter == 2) {
/*             Replace the already used smallest breakpoint with the */
/*             breakpoint numbered nbreak > nlast, before heapsort call. */
        if (ibkmin != nbreak) {
        t[ibkmin] = t[nbreak];
        iorder[ibkmin] = iorder[nbreak];
        }
/*        Update heap structure of breakpoints */
/*           (if iter=2, initialize heap). */
    }
    i__1 = iter - 2;
    hpsolb_(&nleft, &t[1], &iorder[1], &i__1);
    tj = t[nleft];
    ibp = iorder[nleft];
    }
    dt = tj - tj0;
    if (dt != 0. && *iprint >= 100) {
/*
    s_wsfe(&io___117);
    do_fio(&c__1, (char *)&(*nint), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&f1, (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&f2, (ftnlen)sizeof(doublereal));
    e_wsfe();
    s_wsfe(&io___118);
    do_fio(&c__1, (char *)&dt, (ftnlen)sizeof(doublereal));
    e_wsfe();
    s_wsfe(&io___119);
    do_fio(&c__1, (char *)&dtm, (ftnlen)sizeof(doublereal));
    e_wsfe();
*/
    }
/*     If a minimizer is within this interval, locate the GCP and return. */
    if (dtm < dt) {
    goto L888;
    }
/*     Otherwise fix one variable and */
/*       reset the corresponding component of d to zero. */
    tsum += dt;
    --nleft;
    ++iter;
    dibp = d__[ibp];
    d__[ibp] = 0.;
    if (dibp > 0.) {
    zibp = u[ibp] - x[ibp];
    xcp[ibp] = u[ibp];
    iwhere[ibp] = 2;
    } else {
    zibp = l[ibp] - x[ibp];
    xcp[ibp] = l[ibp];
    iwhere[ibp] = 1;
    }
    if (*iprint >= 100) {
/*
    s_wsle(&io___122);
    do_lio(&c__9, &c__1, "Variable  ", (ftnlen)10);
    do_lio(&c__3, &c__1, (char *)&ibp, (ftnlen)sizeof(integer));
    do_lio(&c__9, &c__1, "  is fixed.", (ftnlen)11);
    e_wsle();
*/
    }
    if (nleft == 0 && nbreak == *n) {
/*                                             all n variables are fixed, */
/*                                                return with xcp as GCP. */
    dtm = dt;
    goto L999;
    }
/*     Update the derivative information. */
    ++(*nint);
/* Computing 2nd power */
    d__1 = dibp;
    dibp2 = d__1 * d__1;
/*     Update f1 and f2. */
/*        temporarily set f1 and f2 for col=0. */
    f1 = f1 + dt * f2 + dibp2 - *theta * dibp * zibp;
    f2 -= *theta * dibp2;
    if (*col > 0) {
/*                          update c = c + dt*p. */
    daxpy_(&col2, &dt, &p[1], &c__1, &c__[1], &c__1);
/*           choose wbp, */
/*           the row of W corresponding to the breakpoint encountered. */
    pointr = *head;
    i__1 = *col;
    for (j = 1; j <= i__1; ++j) {
        wbp[j] = wy[ibp + pointr * wy_dim1];
        wbp[*col + j] = *theta * ws[ibp + pointr * ws_dim1];
        pointr = pointr % *m + 1;
/* L70: */
    }
/*           compute (wbp)Mc, (wbp)Mp, and (wbp)M(wbp)'. */
    bmv_(m, &sy[sy_offset], &wt[wt_offset], col, &wbp[1], &v[1], info);
    if (*info != 0) {
        return 0;
    }
    wmc = ddot_(&col2, &c__[1], &c__1, &v[1], &c__1);
    wmp = ddot_(&col2, &p[1], &c__1, &v[1], &c__1);
    wmw = ddot_(&col2, &wbp[1], &c__1, &v[1], &c__1);
/*           update p = p - dibp*wbp. */
    d__1 = -dibp;
    daxpy_(&col2, &d__1, &wbp[1], &c__1, &p[1], &c__1);
/*           complete updating f1 and f2 while col > 0. */
    f1 += dibp * wmc;
    f2 = f2 + dibp * 2. * wmp - dibp2 * wmw;
    }
/* Computing MAX */
    d__1 = *epsmch * f2_org__;
    f2 = max(d__1,f2);
    if (nleft > 0) {
    dtm = -f1 / f2;
    goto L777;
/*                 to repeat the loop for unsearched intervals. */
    } else if (bnded) {
    f1 = 0.;
    f2 = 0.;
    dtm = 0.;
    } else {
    dtm = -f1 / f2;
    }
/* ------------------- the end of the loop ------------------------------- */
L888:
    if (*iprint >= 99) {
/*
    s_wsle(&io___127);
    e_wsle();
    s_wsle(&io___128);
    do_lio(&c__9, &c__1, "GCP found in this segment", (ftnlen)25);
    e_wsle();
    s_wsfe(&io___129);
    do_fio(&c__1, (char *)&(*nint), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&f1, (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&f2, (ftnlen)sizeof(doublereal));
    e_wsfe();
    s_wsfe(&io___130);
    do_fio(&c__1, (char *)&dtm, (ftnlen)sizeof(doublereal));
    e_wsfe();
*/
    }
    if (dtm <= 0.) {
    dtm = 0.;
    }
    tsum += dtm;
/*     Move free variables (i.e., the ones w/o breakpoints) and */
/*       the variables whose breakpoints haven't been reached. */
    daxpy_(n, &tsum, &d__[1], &c__1, &xcp[1], &c__1);
L999:
/*     Update c = c + dtm*p = W'(x^c - x) */
/*       which will be used in computing r = Z'(B(x^c - x) + g). */
    if (*col > 0) {
    daxpy_(&col2, &dtm, &p[1], &c__1, &c__[1], &c__1);
    }
    if (*iprint > 100) {
/*
    s_wsfe(&io___131);
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
        do_fio(&c__1, (char *)&xcp[i__], (ftnlen)sizeof(doublereal));
    }
    e_wsfe();
*/
    }
    if (*iprint >= 99) {
/*
    s_wsfe(&io___132);
    e_wsfe();
*/
    }
    return 0;
} /* cauchy_ */

/* ====================== The end of cauchy ============================== */
/* Subroutine */
static int cmprlb_( integer *n, integer *m, doublereal *x, doublereal *g,
    doublereal *ws, doublereal *wy, doublereal *sy, doublereal *wt,
    doublereal *z__, doublereal *r__, doublereal *wa, integer *index,
    doublereal *theta, integer *col, integer *head, integer *nfree,
    logical *cnstnd, integer *info)
{
    /* System generated locals */
    integer ws_dim1, ws_offset, wy_dim1, wy_offset, sy_dim1, sy_offset,
        wt_dim1, wt_offset, i__1, i__2;

    /* Local variables */
    static integer i__, j, k;
    static doublereal a1, a2;
    static integer pointr;

/*     ************ */

/*     Subroutine cmprlb */

/*       This subroutine computes r=-Z'B(xcp-xk)-Z'g by using */
/*         wa(2m+1)=W'(xcp-x) from subroutine cauchy. */

/*     Subprograms called: */

/*       L-BFGS-B Library ... bmv. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    --index;
    --r__;
    --z__;
    --g;
    --x;
    --wa;
    wt_dim1 = *m;
    wt_offset = 1 + wt_dim1 * 1;
    wt -= wt_offset;
    sy_dim1 = *m;
    sy_offset = 1 + sy_dim1 * 1;
    sy -= sy_offset;
    wy_dim1 = *n;
    wy_offset = 1 + wy_dim1 * 1;
    wy -= wy_offset;
    ws_dim1 = *n;
    ws_offset = 1 + ws_dim1 * 1;
    ws -= ws_offset;

    /* Function Body */
    if (! (*cnstnd) && *col > 0) {
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
        r__[i__] = -g[i__];
/* L26: */
    }
    } else {
    i__1 = *nfree;
    for (i__ = 1; i__ <= i__1; ++i__) {
        k = index[i__];
        r__[i__] = -(*theta) * (z__[k] - x[k]) - g[k];
/* L30: */
    }
    bmv_(m, &sy[sy_offset], &wt[wt_offset], col, &wa[(*m << 1) + 1], &wa[
        1], info);
    if (*info != 0) {
        *info = -8;
        return 0;
    }
    pointr = *head;
    i__1 = *col;
    for (j = 1; j <= i__1; ++j) {
        a1 = wa[j];
        a2 = *theta * wa[*col + j];
        i__2 = *nfree;
        for (i__ = 1; i__ <= i__2; ++i__) {
        k = index[i__];
        r__[i__] = r__[i__] + wy[k + pointr * wy_dim1] * a1 + ws[k +
            pointr * ws_dim1] * a2;
/* L32: */
        }
        pointr = pointr % *m + 1;
/* L34: */
    }
    }
    return 0;
} /* cmprlb_ */

/* ======================= The end of cmprlb ============================= */
/* Subroutine */
static int errclb_( integer *n, integer *m, doublereal *factr, doublereal *l,
    doublereal *u, integer *nbd, char *task, integer *info, integer *k,
    ftnlen task_len)
{
    /* System generated locals */
    integer i__1;

    /* Local variables */
    static integer i__;
    (void)task_len;

/*     ************ */

/*     Subroutine errclb */

/*     This subroutine checks the validity of the input data. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
/*     Check the input arguments for errors. */
    /* Parameter adjustments */
    --nbd;
    --u;
    --l;

    /* Function Body */
    if (*n <= 0) {
    s_copy(task, "ERROR: N .LE. 0", (ftnlen)60, (ftnlen)15);
    }
    if (*m <= 0) {
    s_copy(task, "ERROR: M .LE. 0", (ftnlen)60, (ftnlen)15);
    }
    if (*factr < 0.) {
    s_copy(task, "ERROR: FACTR .LT. 0", (ftnlen)60, (ftnlen)19);
    }
/*     Check the validity of the arrays nbd(i), u(i), and l(i). */
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
    if (nbd[i__] < 0 || nbd[i__] > 3) {
/*                                                   return */
        s_copy(task, "ERROR: INVALID NBD", (ftnlen)60, (ftnlen)18);
        *info = -6;
        *k = i__;
    }
    if (nbd[i__] == 2) {
        if (l[i__] > u[i__]) {
/*                                    return */
        s_copy(task, "ERROR: NO FEASIBLE SOLUTION", (ftnlen)60, (
            ftnlen)27);
        *info = -7;
        *k = i__;
        }
    }
/* L10: */
    }
    return 0;
} /* errclb_ */

/* ======================= The end of errclb ============================= */
/* Subroutine */
static int formk_(
    integer *n, integer *nsub, integer *ind, integer *nenter, integer *ileave, integer *indx2, integer *iupdat,
    logical *updatd, doublereal *wn, doublereal *wn1, integer *m,
    doublereal *ws, doublereal *wy, doublereal *sy, doublereal *theta,
    integer *col, integer *head, integer *info)
{
    /* System generated locals */
    integer wn_dim1, wn_offset, wn1_dim1, wn1_offset, ws_dim1, ws_offset,
        wy_dim1, wy_offset, sy_dim1, sy_offset, i__1, i__2, i__3;

    /* Local variables */
    static integer dend, pend;
    static integer upcl;
    static doublereal temp1, temp2, temp3, temp4;
    static integer i__, k;
    static integer ipntr, jpntr, k1, m2, dbegin, is, js, iy, jy, pbegin, is1,
        js1, col2;

/*     ************ */

/*     Subroutine formk */

/*     This subroutine forms  the LEL^T factorization of the indefinite */

/*       matrix    K = [-D -Y'ZZ'Y/theta     L_a'-R_z'  ] */
/*                     [L_a -R_z           theta*S'AA'S ] */
/*                                                    where E = [-I  0] */
/*                                                              [ 0  I] */
/*     The matrix K can be shown to be equal to the matrix M^[-1]N */
/*       occurring in section 5.1 of [1], as well as to the matrix */
/*       Mbar^[-1] Nbar in section 5.3. */

/*     n is an integer variable. */
/*       On entry n is the dimension of the problem. */
/*       On exit n is unchanged. */

/*     nsub is an integer variable */
/*       On entry nsub is the number of subspace variables in free set. */
/*       On exit nsub is not changed. */

/*     ind is an integer array of dimension nsub. */
/*       On entry ind specifies the indices of subspace variables. */
/*       On exit ind is unchanged. */

/*     nenter is an integer variable. */
/*       On entry nenter is the number of variables entering the */
/*         free set. */
/*       On exit nenter is unchanged. */

/*     ileave is an integer variable. */
/*       On entry indx2(ileave),...,indx2(n) are the variables leaving */
/*         the free set. */
/*       On exit ileave is unchanged. */

/*     indx2 is an integer array of dimension n. */
/*       On entry indx2(1),...,indx2(nenter) are the variables entering */
/*         the free set, while indx2(ileave),...,indx2(n) are the */
/*         variables leaving the free set. */
/*       On exit indx2 is unchanged. */

/*     iupdat is an integer variable. */
/*       On entry iupdat is the total number of BFGS updates made so far. */
/*       On exit iupdat is unchanged. */

/*     updatd is a logical variable. */
/*       On entry 'updatd' is true if the L-BFGS matrix is updatd. */
/*       On exit 'updatd' is unchanged. */

/*     wn is a double precision array of dimension 2m x 2m. */
/*       On entry wn is unspecified. */
/*       On exit the upper triangle of wn stores the LEL^T factorization */
/*         of the 2*col x 2*col indefinite matrix */
/*                     [-D -Y'ZZ'Y/theta     L_a'-R_z'  ] */
/*                     [L_a -R_z           theta*S'AA'S ] */

/*     wn1 is a double precision array of dimension 2m x 2m. */
/*       On entry wn1 stores the lower triangular part of */
/*                     [Y' ZZ'Y   L_a'+R_z'] */
/*                     [L_a+R_z   S'AA'S   ] */
/*         in the previous iteration. */
/*       On exit wn1 stores the corresponding updated matrices. */
/*       The purpose of wn1 is just to store these inner products */
/*       so they can be easily updated and inserted into wn. */

/*     m is an integer variable. */
/*       On entry m is the maximum number of variable metric corrections */
/*         used to define the limited memory matrix. */
/*       On exit m is unchanged. */

/*     ws, wy, sy, and wtyy are double precision arrays; */
/*     theta is a double precision variable; */
/*     col is an integer variable; */
/*     head is an integer variable. */
/*       On entry they store the information defining the */
/*                                          limited memory BFGS matrix: */
/*         ws(n,m) stores S, a set of s-vectors; */
/*         wy(n,m) stores Y, a set of y-vectors; */
/*         sy(m,m) stores S'Y; */
/*         wtyy(m,m) stores the Cholesky factorization */
/*                                   of (theta*S'S+LD^(-1)L') */
/*         theta is the scaling factor specifying B_0 = theta I; */
/*         col is the number of variable metric corrections stored; */
/*         head is the location of the 1st s- (or y-) vector in S (or Y). */
/*       On exit they are unchanged. */

/*     info is an integer variable. */
/*       On entry info is unspecified. */
/*       On exit info =  0 for normal return; */
/*                    = -1 when the 1st Cholesky factorization failed; */
/*                    = -2 when the 2st Cholesky factorization failed. */

/*     Subprograms called: */

/*       Linpack ... dcopy, dpofa, dtrsl. */


/*     References: */
/*       [1] R. H. Byrd, P. Lu, J. Nocedal and C. Zhu, ``A limited */
/*       memory algorithm for bound constrained optimization'', */
/*       SIAM J. Scientific Computing 16 (1995), no. 5, pp. 1190--1208. */

/*       [2] C. Zhu, R.H. Byrd, P. Lu, J. Nocedal, ``L-BFGS-B: a */
/*       limited memory FORTRAN code for solving bound constrained */
/*       optimization problems'', Tech. Report, NAM-11, EECS Department, */
/*       Northwestern University, 1994. */

/*       (Postscript files of these papers are available via anonymous */
/*        ftp to eecs.nwu.edu in the directory pub/lbfgs/lbfgs_bcm.) */

/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
/*     Form the lower triangular part of */
/*               WN1 = [Y' ZZ'Y   L_a'+R_z'] */
/*                     [L_a+R_z   S'AA'S   ] */
/*        where L_a is the strictly lower triangular part of S'AA'Y */
/*              R_z is the upper triangular part of S'ZZ'Y. */
    /* Parameter adjustments */
    --indx2;
    --ind;
    sy_dim1 = *m;
    sy_offset = 1 + sy_dim1 * 1;
    sy -= sy_offset;
    wy_dim1 = *n;
    wy_offset = 1 + wy_dim1 * 1;
    wy -= wy_offset;
    ws_dim1 = *n;
    ws_offset = 1 + ws_dim1 * 1;
    ws -= ws_offset;
    wn1_dim1 = 2 * *m;
    wn1_offset = 1 + wn1_dim1 * 1;
    wn1 -= wn1_offset;
    wn_dim1 = 2 * *m;
    wn_offset = 1 + wn_dim1 * 1;
    wn -= wn_offset;

    /* Function Body */
    if (*updatd) {
    if (*iupdat > *m) {
/*                                 shift old part of WN1. */
        i__1 = *m - 1;
        for (jy = 1; jy <= i__1; ++jy) {
        js = *m + jy;
        i__2 = *m - jy;
        dcopy_(&i__2, &wn1[jy + 1 + (jy + 1) * wn1_dim1], &c__1, &wn1[
            jy + jy * wn1_dim1], &c__1);
        i__2 = *m - jy;
        dcopy_(&i__2, &wn1[js + 1 + (js + 1) * wn1_dim1], &c__1, &wn1[
            js + js * wn1_dim1], &c__1);
        i__2 = *m - 1;
        dcopy_(&i__2, &wn1[*m + 2 + (jy + 1) * wn1_dim1], &c__1, &wn1[
            *m + 1 + jy * wn1_dim1], &c__1);
/* L10: */
        }
    }
/*          put new rows in blocks (1,1), (2,1) and (2,2). */
    pbegin = 1;
    pend = *nsub;
    dbegin = *nsub + 1;
    dend = *n;
    iy = *col;
    is = *m + *col;
    ipntr = *head + *col - 1;
    if (ipntr > *m) {
        ipntr -= *m;
    }
    jpntr = *head;
    i__1 = *col;
    for (jy = 1; jy <= i__1; ++jy) {
        js = *m + jy;
        temp1 = 0.;
        temp2 = 0.;
        temp3 = 0.;
/*             compute element jy of row 'col' of Y'ZZ'Y */
        i__2 = pend;
        for (k = pbegin; k <= i__2; ++k) {
        k1 = ind[k];
        temp1 += wy[k1 + ipntr * wy_dim1] * wy[k1 + jpntr * wy_dim1];
/* L15: */
        }
/*             compute elements jy of row 'col' of L_a and S'AA'S */
        i__2 = dend;
        for (k = dbegin; k <= i__2; ++k) {
        k1 = ind[k];
        temp2 += ws[k1 + ipntr * ws_dim1] * ws[k1 + jpntr * ws_dim1];
        temp3 += ws[k1 + ipntr * ws_dim1] * wy[k1 + jpntr * wy_dim1];
/* L16: */
        }
        wn1[iy + jy * wn1_dim1] = temp1;
        wn1[is + js * wn1_dim1] = temp2;
        wn1[is + jy * wn1_dim1] = temp3;
        jpntr = jpntr % *m + 1;
/* L20: */
    }
/*          put new column in block (2,1). */
    jy = *col;
    jpntr = *head + *col - 1;
    if (jpntr > *m) {
        jpntr -= *m;
    }
    ipntr = *head;
    i__1 = *col;
    for (i__ = 1; i__ <= i__1; ++i__) {
        is = *m + i__;
        temp3 = 0.;
/*             compute element i of column 'col' of R_z */
        i__2 = pend;
        for (k = pbegin; k <= i__2; ++k) {
        k1 = ind[k];
        temp3 += ws[k1 + ipntr * ws_dim1] * wy[k1 + jpntr * wy_dim1];
/* L25: */
        }
        ipntr = ipntr % *m + 1;
        wn1[is + jy * wn1_dim1] = temp3;
/* L30: */
    }
    upcl = *col - 1;
    } else {
    upcl = *col;
    }
/*       modify the old parts in blocks (1,1) and (2,2) due to changes */
/*       in the set of free variables. */
    ipntr = *head;
    i__1 = upcl;
    for (iy = 1; iy <= i__1; ++iy) {
    is = *m + iy;
    jpntr = *head;
    i__2 = iy;
    for (jy = 1; jy <= i__2; ++jy) {
        js = *m + jy;
        temp1 = 0.;
        temp2 = 0.;
        temp3 = 0.;
        temp4 = 0.;
        i__3 = *nenter;
        for (k = 1; k <= i__3; ++k) {
        k1 = indx2[k];
        temp1 += wy[k1 + ipntr * wy_dim1] * wy[k1 + jpntr * wy_dim1];
        temp2 += ws[k1 + ipntr * ws_dim1] * ws[k1 + jpntr * ws_dim1];
/* L35: */
        }
        i__3 = *n;
        for (k = *ileave; k <= i__3; ++k) {
        k1 = indx2[k];
        temp3 += wy[k1 + ipntr * wy_dim1] * wy[k1 + jpntr * wy_dim1];
        temp4 += ws[k1 + ipntr * ws_dim1] * ws[k1 + jpntr * ws_dim1];
/* L36: */
        }
        wn1[iy + jy * wn1_dim1] = wn1[iy + jy * wn1_dim1] + temp1 - temp3;
        wn1[is + js * wn1_dim1] = wn1[is + js * wn1_dim1] - temp2 + temp4;
        jpntr = jpntr % *m + 1;
/* L40: */
    }
    ipntr = ipntr % *m + 1;
/* L45: */
    }
/*       modify the old parts in block (2,1). */
    ipntr = *head;
    i__1 = *m + upcl;
    for (is = *m + 1; is <= i__1; ++is) {
    jpntr = *head;
    i__2 = upcl;
    for (jy = 1; jy <= i__2; ++jy) {
        temp1 = 0.;
        temp3 = 0.;
        i__3 = *nenter;
        for (k = 1; k <= i__3; ++k) {
        k1 = indx2[k];
        temp1 += ws[k1 + ipntr * ws_dim1] * wy[k1 + jpntr * wy_dim1];
/* L50: */
        }
        i__3 = *n;
        for (k = *ileave; k <= i__3; ++k) {
        k1 = indx2[k];
        temp3 += ws[k1 + ipntr * ws_dim1] * wy[k1 + jpntr * wy_dim1];
/* L51: */
        }
        if (is <= jy + *m) {
        wn1[is + jy * wn1_dim1] = wn1[is + jy * wn1_dim1] + temp1 -
            temp3;
        } else {
        wn1[is + jy * wn1_dim1] = wn1[is + jy * wn1_dim1] - temp1 +
            temp3;
        }
        jpntr = jpntr % *m + 1;
/* L55: */
    }
    ipntr = ipntr % *m + 1;
/* L60: */
    }
/*     Form the upper triangle of WN = [D+Y' ZZ'Y/theta   -L_a'+R_z' ] */
/*                                     [-L_a +R_z        S'AA'S*theta] */
    m2 = *m << 1;
    i__1 = *col;
    for (iy = 1; iy <= i__1; ++iy) {
    is = *col + iy;
    is1 = *m + iy;
    i__2 = iy;
    for (jy = 1; jy <= i__2; ++jy) {
        js = *col + jy;
        js1 = *m + jy;
        wn[jy + iy * wn_dim1] = wn1[iy + jy * wn1_dim1] / *theta;
        wn[js + is * wn_dim1] = wn1[is1 + js1 * wn1_dim1] * *theta;
/* L65: */
    }
    i__2 = iy - 1;
    for (jy = 1; jy <= i__2; ++jy) {
        wn[jy + is * wn_dim1] = -wn1[is1 + jy * wn1_dim1];
/* L66: */
    }
    i__2 = *col;
    for (jy = iy; jy <= i__2; ++jy) {
        wn[jy + is * wn_dim1] = wn1[is1 + jy * wn1_dim1];
/* L67: */
    }
    wn[iy + iy * wn_dim1] += sy[iy + iy * sy_dim1];
/* L70: */
    }
/*     Form the upper triangle of WN= [  LL'            L^-1(-L_a'+R_z')] */
/*                                    [(-L_a +R_z)L'^-1   S'AA'S*theta  ] */
/*        first Cholesky factor (1,1) block of wn to get LL' */
/*                          with L' stored in the upper triangle of wn. */
    dpofa_(&wn[wn_offset], &m2, col, info);
    if (*info != 0) {
    *info = -1;
    return 0;
    }
/*        then form L^-1(-L_a'+R_z') in the (1,2) block. */
    col2 = *col << 1;
    i__1 = col2;
    for (js = *col + 1; js <= i__1; ++js) {
    dtrsl_(&wn[wn_offset], &m2, col, &wn[js * wn_dim1 + 1], &c__11, info);
/* L71: */
    }
/*     Form S'AA'S*theta + (L^-1(-L_a'+R_z'))'L^-1(-L_a'+R_z') in the */
/*        upper triangle of (2,2) block of wn. */
    i__1 = col2;
    for (is = *col + 1; is <= i__1; ++is) {
    i__2 = col2;
    for (js = is; js <= i__2; ++js) {
        wn[is + js * wn_dim1] += ddot_(col, &wn[is * wn_dim1 + 1], &c__1,
            &wn[js * wn_dim1 + 1], &c__1);
/* L74: */
    }
/* L72: */
    }
/*     Cholesky factorization of (2,2) block of wn. */
    dpofa_(&wn[*col + 1 + (*col + 1) * wn_dim1], &m2, col, info);
    if (*info != 0) {
    *info = -2;
    return 0;
    }
    return 0;
} /* formk_ */

/* ======================= The end of formk ============================== */
/* Subroutine */
static int formt_( integer *m, doublereal *wt, doublereal *sy, doublereal *ss,
integer *col, doublereal *theta, integer *info)
{
    /* System generated locals */
    integer wt_dim1, wt_offset, sy_dim1, sy_offset, ss_dim1, ss_offset, i__1,
        i__2, i__3;

    /* Local variables */
    static doublereal ddum;
    static integer i__, j, k;
    static integer k1;

/*     ************ */

/*     Subroutine formt */

/*       This subroutine forms the upper half of the pos. def. and symm. */
/*         T = theta*SS + L*D^(-1)*L', stores T in the upper triangle */
/*         of the array wt, and performs the Cholesky factorization of T */
/*         to produce J*J', with J' stored in the upper triangle of wt. */

/*     Subprograms called: */

/*       Linpack ... dpofa. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
/*     Form the upper half of  T = theta*SS + L*D^(-1)*L', */
/*        store T in the upper triangle of the array wt. */
    /* Parameter adjustments */
    ss_dim1 = *m;
    ss_offset = 1 + ss_dim1 * 1;
    ss -= ss_offset;
    sy_dim1 = *m;
    sy_offset = 1 + sy_dim1 * 1;
    sy -= sy_offset;
    wt_dim1 = *m;
    wt_offset = 1 + wt_dim1 * 1;
    wt -= wt_offset;

    /* Function Body */
    i__1 = *col;
    for (j = 1; j <= i__1; ++j) {
    wt[j * wt_dim1 + 1] = *theta * ss[j * ss_dim1 + 1];
/* L52: */
    }
    i__1 = *col;
    for (i__ = 2; i__ <= i__1; ++i__) {
    i__2 = *col;
    for (j = i__; j <= i__2; ++j) {
        k1 = min(i__,j) - 1;
        ddum = 0.;
        i__3 = k1;
        for (k = 1; k <= i__3; ++k) {
        ddum += sy[i__ + k * sy_dim1] * sy[j + k * sy_dim1] / sy[k +
            k * sy_dim1];
/* L53: */
        }
        wt[i__ + j * wt_dim1] = ddum + *theta * ss[i__ + j * ss_dim1];
/* L54: */
    }
/* L55: */
    }
/*     Cholesky factorize T to J*J' with */
/*        J' stored in the upper triangle of wt. */
    dpofa_(&wt[wt_offset], m, col, info);
    if (*info != 0) {
    *info = -3;
    }
    return 0;
} /* formt_ */

/* ======================= The end of formt ============================== */
/* Subroutine */
static int freev_(
integer *n, integer *nfree, integer *index, integer *nenter, integer *ileave, integer *indx2, integer *iwhere,
logical *wrk, logical *updatd, logical *cnstnd, integer *iprint, integer *iter)
{
    /* System generated locals */
    integer i__1;

    /* Local variables */
    static integer iact, i__, k;

    /* Fortran I/O blocks */
/*
    static cilist io___169 = { 0, 6, 0, 0, 0 };
    static cilist io___170 = { 0, 6, 0, 0, 0 };
    static cilist io___171 = { 0, 6, 0, 0, 0 };
    static cilist io___173 = { 0, 6, 0, 0, 0 };
*/


/*     ************ */

/*     Subroutine freev */

/*     This subroutine counts the entering and leaving variables when */
/*       iter > 0, and finds the index set of free and active variables */
/*       at the GCP. */

/*     cnstnd is a logical variable indicating whether bounds are present */

/*     index is an integer array of dimension n */
/*       for i=1,...,nfree, index(i) are the indices of free variables */
/*       for i=nfree+1,...,n, index(i) are the indices of bound variables */
/*       On entry after the first iteration, index gives */
/*         the free variables at the previous iteration. */
/*       On exit it gives the free variables based on the determination */
/*         in cauchy using the array iwhere. */

/*     indx2 is an integer array of dimension n */
/*       On entry indx2 is unspecified. */
/*       On exit with iter>0, indx2 indicates which variables */
/*          have changed status since the previous iteration. */
/*       For i= 1,...,nenter, indx2(i) have changed from bound to free. */
/*       For i= ileave+1,...,n, indx2(i) have changed from free to bound. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    --iwhere;
    --indx2;
    --index;

    /* Function Body */
    *nenter = 0;
    *ileave = *n + 1;
    if (*iter > 0 && *cnstnd) {
/*                           count the entering and leaving variables. */
    i__1 = *nfree;
    for (i__ = 1; i__ <= i__1; ++i__) {
        k = index[i__];
        if (iwhere[k] > 0) {
        --(*ileave);
        indx2[*ileave] = k;
        if (*iprint >= 100) {
/*
            s_wsle(&io___169);
            do_lio(&c__9, &c__1, "Variable ", (ftnlen)9);
            do_lio(&c__3, &c__1, (char *)&k, (ftnlen)sizeof(integer));
            do_lio(&c__9, &c__1, " leaves the set of free variables",
                (ftnlen)33);
            e_wsle();
*/
        }
        }
/* L20: */
    }
    i__1 = *n;
    for (i__ = *nfree + 1; i__ <= i__1; ++i__) {
        k = index[i__];
        if (iwhere[k] <= 0) {
        ++(*nenter);
        indx2[*nenter] = k;
        if (*iprint >= 100) {
/*
            s_wsle(&io___170);
            do_lio(&c__9, &c__1, "Variable ", (ftnlen)9);
            do_lio(&c__3, &c__1, (char *)&k, (ftnlen)sizeof(integer));
            do_lio(&c__9, &c__1, " enters the set of free variables",
                (ftnlen)33);
            e_wsle();
*/
        }
        }
/* L22: */
    }
    if (*iprint >= 99) {
/*
        s_wsle(&io___171);
        i__1 = *n + 1 - *ileave;
        do_lio(&c__3, &c__1, (char *)&i__1, (ftnlen)sizeof(integer));
        do_lio(&c__9, &c__1, " variables leave; ", (ftnlen)18);
        do_lio(&c__3, &c__1, (char *)&(*nenter), (ftnlen)sizeof(integer));
        do_lio(&c__9, &c__1, " variables enter", (ftnlen)16);
        e_wsle();
*/
    }
    }
    *wrk = *ileave < *n + 1 || *nenter > 0 || *updatd;
/*     Find the index set of free and active variables at the GCP. */
    *nfree = 0;
    iact = *n + 1;
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
    if (iwhere[i__] <= 0) {
        ++(*nfree);
        index[*nfree] = i__;
    } else {
        --iact;
        index[iact] = i__;
    }
/* L24: */
    }
    if (*iprint >= 99) {
/*
    s_wsle(&io___173);
    do_lio(&c__3, &c__1, (char *)&(*nfree), (ftnlen)sizeof(integer));
    do_lio(&c__9, &c__1, " variables are free at GCP ", (ftnlen)27);
    i__1 = *iter + 1;
    do_lio(&c__3, &c__1, (char *)&i__1, (ftnlen)sizeof(integer));
    e_wsle();
*/
    }
    return 0;
} /* freev_ */

/* ======================= The end of freev ============================== */
/* Subroutine */
static int hpsolb_( integer *n, doublereal *t, integer *iorder, integer *iheap)
{
    /* System generated locals */
    integer i__1;

    /* Local variables */
    static doublereal ddum;
    static integer i__, j, k, indxin, indxou;
    static doublereal out;

/*     ************ */

/*     Subroutine hpsolb */

/*     This subroutine sorts out the least element of t, and puts the */
/*       remaining elements of t in a heap. */

/*     n is an integer variable. */
/*       On entry n is the dimension of the arrays t and iorder. */
/*       On exit n is unchanged. */

/*     t is a double precision array of dimension n. */
/*       On entry t stores the elements to be sorted, */
/*       On exit t(n) stores the least elements of t, and t(1) to t(n-1) */
/*         stores the remaining elements in the form of a heap. */

/*     iorder is an integer array of dimension n. */
/*       On entry iorder(i) is the index of t(i). */
/*       On exit iorder(i) is still the index of t(i), but iorder may be */
/*         permuted in accordance with t. */

/*     iheap is an integer variable specifying the task. */
/*       On entry iheap should be set as follows: */
/*         iheap .eq. 0 if t(1) to t(n) is not in the form of a heap, */
/*         iheap .ne. 0 if otherwise. */
/*       On exit iheap is unchanged. */


/*     References: */
/*       Algorithm 232 of CACM (J. W. J. Williams): HEAPSORT. */

/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */

/*     ************ */
    /* Parameter adjustments */
    --iorder;
    --t;

    /* Function Body */
    if (*iheap == 0) {
/*        Rearrange the elements t(1) to t(n) to form a heap. */
    i__1 = *n;
    for (k = 2; k <= i__1; ++k) {
        ddum = t[k];
        indxin = iorder[k];
/*           Add ddum to the heap. */
        i__ = k;
L10:
        if (i__ > 1) {
        j = i__ / 2;
        if (ddum < t[j]) {
            t[i__] = t[j];
            iorder[i__] = iorder[j];
            i__ = j;
            goto L10;
        }
        }
        t[i__] = ddum;
        iorder[i__] = indxin;
/* L20: */
    }
    }
/*     Assign to 'out' the value of t(1), the least member of the heap, */
/*        and rearrange the remaining members to form a heap as */
/*        elements 1 to n-1 of t. */
    if (*n > 1) {
    i__ = 1;
    out = t[1];
    indxou = iorder[1];
    ddum = t[*n];
    indxin = iorder[*n];
/*        Restore the heap */
L30:
    j = i__ + i__;
    if (j <= *n - 1) {
        if (t[j + 1] < t[j]) {
        ++j;
        }
        if (t[j] < ddum) {
        t[i__] = t[j];
        iorder[i__] = iorder[j];
        i__ = j;
        goto L30;
        }
    }
    t[i__] = ddum;
    iorder[i__] = indxin;
/*     Put the least member in t(n). */
    t[*n] = out;
    iorder[*n] = indxou;
    }
    return 0;
} /* hpsolb_ */

/* ====================== The end of hpsolb ============================== */
/* Subroutine */
static int lnsrlb_( integer *n, doublereal *l, doublereal *u, integer *nbd,
doublereal *x, doublereal *f, doublereal *fold, doublereal *gd, doublereal *gdold,
doublereal *g, doublereal *d__, doublereal *r__, doublereal *t, doublereal *z__,
doublereal *stp, doublereal *dnorm, doublereal *dtd, doublereal *xstep, doublereal *stpmx,
integer *iter, integer *ifun, integer *iback, integer *nfgv, integer *info,
char *task, logical *boxed, logical *cnstnd, char *csave, integer *isave,
doublereal *dsave, ftnlen task_len, ftnlen csave_len)
{
    /* System generated locals */
    integer i__1;
    doublereal d__1;

    /* Local variables */
    static integer i__;
    static doublereal a1, a2;
    (void)task_len;
    (void)csave_len;

/*     ********** */

/*     Subroutine lnsrlb */

/*     This subroutine calls subroutine dcsrch from the Minpack2 library */
/*       to perform the line search.  Subroutine dscrch is safeguarded so */
/*       that all trial points lie within the feasible region. */

/*     Subprograms called: */

/*       Minpack2 Library ... dcsrch. */

/*       Linpack ... dtrsl, ddot. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ********** */
    /* Parameter adjustments */
    --z__;
    --t;
    --r__;
    --d__;
    --g;
    --x;
    --nbd;
    --u;
    --l;
    --isave;
    --dsave;

    /* Function Body */
    if (s_cmp(task, "FG_LN", (ftnlen)5, (ftnlen)5) == 0) {
    goto L556;
    }
    *dtd = ddot_(n, &d__[1], &c__1, &d__[1], &c__1);
    *dnorm = sqrt(*dtd);
/*     Determine the maximum step length. */
    *stpmx = 1e10;
    if (*cnstnd) {
    if (*iter == 0) {
        *stpmx = 1.;
    } else {
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
        a1 = d__[i__];
        if (nbd[i__] != 0) {
            if (a1 < 0. && nbd[i__] <= 2) {
            a2 = l[i__] - x[i__];
            if (a2 >= 0.) {
                *stpmx = 0.;
            } else if (a1 * *stpmx < a2) {
                *stpmx = a2 / a1;
            }
            } else if (a1 > 0. && nbd[i__] >= 2) {
            a2 = u[i__] - x[i__];
            if (a2 <= 0.) {
                *stpmx = 0.;
            } else if (a1 * *stpmx > a2) {
                *stpmx = a2 / a1;
            }
            }
        }
/* L43: */
        }
    }
    }
    if (*iter == 0 && ! (*boxed)) {
/* Computing MIN */
    d__1 = 1. / *dnorm;
    *stp = min(d__1,*stpmx);
    } else {
    *stp = 1.;
    }
    dcopy_(n, &x[1], &c__1, &t[1], &c__1);
    dcopy_(n, &g[1], &c__1, &r__[1], &c__1);
    *fold = *f;
    *ifun = 0;
    *iback = 0;
    s_copy(csave, "START", (ftnlen)60, (ftnlen)5);
L556:
    *gd = ddot_(n, &g[1], &c__1, &d__[1], &c__1);
    if (*ifun == 0) {
    *gdold = *gd;
    if (*gd >= 0.) {
/*                               the directional derivative >=0. */
/*                               Line search is impossible. */
        *info = -4;
        return 0;
    }
    }
    dcsrch_(f, gd, stp, &c_b275, &c_b276, &c_b277, &c_b9, stpmx, csave, &
        isave[1], &dsave[1], (ftnlen)60);
    *xstep = *stp * *dnorm;
    if (s_cmp(csave, "CONV", (ftnlen)4, (ftnlen)4) != 0 && s_cmp(csave, "WARN"
        , (ftnlen)4, (ftnlen)4) != 0) {
    s_copy(task, "FG_LNSRCH", (ftnlen)60, (ftnlen)9);
    ++(*ifun);
    ++(*nfgv);
    *iback = *ifun - 1;
    if (*stp == 1.) {
        dcopy_(n, &z__[1], &c__1, &x[1], &c__1);
    } else {
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
        x[i__] = *stp * d__[i__] + t[i__];
/* L41: */
        }
    }
    } else {
    s_copy(task, "NEW_X", (ftnlen)60, (ftnlen)5);
    }
    return 0;
} /* lnsrlb_ */

/* ======================= The end of lnsrlb ============================= */
/* Subroutine */
static int matupd_( integer *n, integer *m,
doublereal *ws, doublereal *wy, doublereal *sy, doublereal *ss, doublereal *d__, doublereal *r__,
integer *itail, integer *iupdat, integer *col, integer *head,
doublereal *theta, doublereal *rr, doublereal *dr, doublereal *stp, doublereal *dtd)
{
    /* System generated locals */
    integer ws_dim1, ws_offset, wy_dim1, wy_offset, sy_dim1, sy_offset,
        ss_dim1, ss_offset, i__1, i__2;

    /* Local variables */
    static integer j;
    static integer pointr;

/*     ************ */

/*     Subroutine matupd */

/*       This subroutine updates matrices WS and WY, and forms the */
/*         middle matrix in B. */

/*     Subprograms called: */

/*       Linpack ... dcopy, ddot. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
/*     Set pointers for matrices WS and WY. */
    /* Parameter adjustments */
    --r__;
    --d__;
    ss_dim1 = *m;
    ss_offset = 1 + ss_dim1 * 1;
    ss -= ss_offset;
    sy_dim1 = *m;
    sy_offset = 1 + sy_dim1 * 1;
    sy -= sy_offset;
    wy_dim1 = *n;
    wy_offset = 1 + wy_dim1 * 1;
    wy -= wy_offset;
    ws_dim1 = *n;
    ws_offset = 1 + ws_dim1 * 1;
    ws -= ws_offset;

    /* Function Body */
    if (*iupdat <= *m) {
    *col = *iupdat;
    *itail = (*head + *iupdat - 2) % *m + 1;
    } else {
    *itail = *itail % *m + 1;
    *head = *head % *m + 1;
    }
/*     Update matrices WS and WY. */
    dcopy_(n, &d__[1], &c__1, &ws[*itail * ws_dim1 + 1], &c__1);
    dcopy_(n, &r__[1], &c__1, &wy[*itail * wy_dim1 + 1], &c__1);
/*     Set theta=yy/ys. */
    *theta = *rr / *dr;
/*     Form the middle matrix in B. */
/*        update the upper triangle of SS, */
/*                                         and the lower triangle of SY: */
    if (*iupdat > *m) {
/*                              move old information */
    i__1 = *col - 1;
    for (j = 1; j <= i__1; ++j) {
        dcopy_(&j, &ss[(j + 1) * ss_dim1 + 2], &c__1, &ss[j * ss_dim1 + 1]
            , &c__1);
        i__2 = *col - j;
        dcopy_(&i__2, &sy[j + 1 + (j + 1) * sy_dim1], &c__1, &sy[j + j *
            sy_dim1], &c__1);
/* L50: */
    }
    }
/*        add new information: the last row of SY */
/*                                             and the last column of SS: */
    pointr = *head;
    i__1 = *col - 1;
    for (j = 1; j <= i__1; ++j) {
    sy[*col + j * sy_dim1] = ddot_(n, &d__[1], &c__1, &wy[pointr *
        wy_dim1 + 1], &c__1);
    ss[j + *col * ss_dim1] = ddot_(n, &ws[pointr * ws_dim1 + 1], &c__1, &
        d__[1], &c__1);
    pointr = pointr % *m + 1;
/* L51: */
    }
    if (*stp == 1.) {
    ss[*col + *col * ss_dim1] = *dtd;
    } else {
    ss[*col + *col * ss_dim1] = *stp * *stp * *dtd;
    }
    sy[*col + *col * sy_dim1] = *dr;
    return 0;
} /* matupd_ */

/* ======================= The end of matupd ============================= */
/* Subroutine */
static int prn1lb_( integer *n, integer *m, doublereal *l, doublereal *u, doublereal *x,
integer *iprint, integer *itfile, doublereal *epsmch)
{
  (void)n;
  (void)m;
  (void)l;
  (void)u;
  (void)x;
  (void)iprint;
  (void)itfile;
  (void)epsmch;
#if 0
    /* Format strings */
/*
    static char fmt_7001[] = "(\002RUNNING THE L-BFGS-B CODE\002,/,/,\002   \
        * * *\002,/,/,\002Machine precision =\002,1p,d10.3)";
    static char fmt_2001[] = "(\002RUNNING THE L-BFGS-B CODE\002,/,/,\002it \
   = iteration number\002,/,\002nf    = number of function evaluations\002,/,\
\002nint  = number of segments explored during the Cauchy search\002,/,\002n\
act  = number of active bounds at the generalized Cauchy point\002,/,\002sub\
   = manner in which the subspace minimization terminated:\002,/,\002       \
 con = converged, bnd = a bound was reached\002,/,\002itls  = number of iter\
ations performed in the line search\002,/,\002stepl = step length used\002,/,\
\002tstep = norm of the displacement (total step)\002,/,\002projg = norm of \
the projected gradient\002,/,\002f     = function value\002,/,/,\002        \
   * * *\002,/,/,\002Machine precision =\002,1p,d10.3)";
    static char fmt_9001[] = "(/,3x,\002it\002,3x,\002nf\002,2x,\002nint\002\
,2x,\002nact\002,2x,\002sub\002,2x,\002itls\002,2x,\002stepl\002,4x,\002tstep\
\002,5x,\002projg\002,8x,\002f\002)";
    static char fmt_1004[] = "(/,a4,1p,6(1x,d11.4),/,(4x,1p,6(1x,d11.4)))";
*/
    /* System generated locals */
    integer i__1;

    /* Local variables */
    static integer i__;

    /* Fortran I/O blocks */
    static cilist io___186 = { 0, 6, 0, fmt_7001, 0 };
    static cilist io___187 = { 0, 6, 0, 0, 0 };
    static cilist io___188 = { 0, 0, 0, fmt_2001, 0 };
    static cilist io___189 = { 0, 0, 0, 0, 0 };
    static cilist io___190 = { 0, 0, 0, fmt_9001, 0 };
    static cilist io___191 = { 0, 6, 0, fmt_1004, 0 };
    static cilist io___193 = { 0, 6, 0, fmt_1004, 0 };
    static cilist io___194 = { 0, 6, 0, fmt_1004, 0 };


/*     ************ */

/*     Subroutine prn1lb */

/*     This subroutine prints the input data, initial point, upper and */
/*       lower bounds of each variable, machine precision, as well as */
/*       the headings of the output. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    --x;
    --u;
    --l;

    /* Function Body */
    if (*iprint >= 0) {

    s_wsfe(&io___186);
    do_fio(&c__1, (char *)&(*epsmch), (ftnlen)sizeof(doublereal));
    e_wsfe();

    s_wsle(&io___187);
    do_lio(&c__9, &c__1, "N = ", (ftnlen)4);
    do_lio(&c__3, &c__1, (char *)&(*n), (ftnlen)sizeof(integer));
    do_lio(&c__9, &c__1, "    M = ", (ftnlen)8);
    do_lio(&c__3, &c__1, (char *)&(*m), (ftnlen)sizeof(integer));
    e_wsle();
    if (*iprint >= 1) {

        io___188.ciunit = *itfile;
        s_wsfe(&io___188);
        do_fio(&c__1, (char *)&(*epsmch), (ftnlen)sizeof(doublereal));
        e_wsfe();

        io___189.ciunit = *itfile;
        s_wsle(&io___189);
        do_lio(&c__9, &c__1, "N = ", (ftnlen)4);
        do_lio(&c__3, &c__1, (char *)&(*n), (ftnlen)sizeof(integer));
        do_lio(&c__9, &c__1, "    M = ", (ftnlen)8);
        do_lio(&c__3, &c__1, (char *)&(*m), (ftnlen)sizeof(integer));
        e_wsle();

        io___190.ciunit = *itfile;
        s_wsfe(&io___190);
        e_wsfe();


        if (*iprint > 100) {
        s_wsfe(&io___191);
        do_fio(&c__1, "L =", (ftnlen)3);
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
            do_fio(&c__1, (char *)&l[i__], (ftnlen)sizeof(doublereal))
                ;
        }
        e_wsfe();
        s_wsfe(&io___193);
        do_fio(&c__1, "X0 =", (ftnlen)4);
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
            do_fio(&c__1, (char *)&x[i__], (ftnlen)sizeof(doublereal))
                ;
        }
        e_wsfe();
        s_wsfe(&io___194);
        do_fio(&c__1, "U =", (ftnlen)3);
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
            do_fio(&c__1, (char *)&u[i__], (ftnlen)sizeof(doublereal))
                ;
        }
        e_wsfe();
        }

    }
    }
#endif
    return 0;
} /* prn1lb_ */

/* ======================= The end of prn1lb ============================= */
/* Subroutine */
static int prn2lb_( integer *n, doublereal *x, doublereal *f, doublereal *g,
integer *iprint, integer *itfile, integer *iter, integer *nfgv, integer *nact,
doublereal *sbgnrm, integer *nint, char *word, integer *iword, integer *iback,
doublereal *stp, doublereal *xstep, ftnlen word_len)
{
  (void)n;
  (void)x;
  (void)f;
  (void)g;
  (void)iprint;
  (void)itfile;
  (void)iter;
  (void)nfgv;
  (void)nact;
  (void)sbgnrm;
  (void)nint;
  (void)word;
  (void)iword;
  (void)iback;
  (void)stp;
  (void)xstep;
  (void)word_len;
#if 0
    /* Format strings */
    static char fmt_2001[] = "(/,\002At iterate\002,i5,4x,\002f= \002,1p,d12\
.5,4x,\002|proj g|= \002,1p,d12.5)";
    static char fmt_1004[] = "(/,a4,1p,6(1x,d11.4),/,(4x,1p,6(1x,d11.4)))";
    static char fmt_3001[] = "(2(1x,i4),2(1x,i5),2x,a3,1x,i4,1p,2(2x,d7.1),1\
p,2(1x,d10.3))";

    /* System generated locals */
    integer i__1;

    /* Local variables */
    static integer imod, i__;

    /* Fortran I/O blocks */
    static cilist io___195 = { 0, 6, 0, 0, 0 };
    static cilist io___196 = { 0, 6, 0, fmt_2001, 0 };
    static cilist io___197 = { 0, 6, 0, fmt_1004, 0 };
    static cilist io___199 = { 0, 6, 0, fmt_1004, 0 };
    static cilist io___201 = { 0, 6, 0, fmt_2001, 0 };
    static cilist io___202 = { 0, 0, 0, fmt_3001, 0 };


/*     ************ */

/*     Subroutine prn2lb */

/*     This subroutine prints out new information after a successful */
/*       line search. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
/*           'word' records the status of subspace solutions. */
    /* Parameter adjustments */
    --g;
    --x;

    /* Function Body */
    if (*iword == 0) {
/*                            the subspace minimization converged. */
    s_copy(word, "con", (ftnlen)3, (ftnlen)3);
    } else if (*iword == 1) {
/*                          the subspace minimization stopped at a bound. */
    s_copy(word, "bnd", (ftnlen)3, (ftnlen)3);
    } else if (*iword == 5) {
/*                             the truncated Newton step has been used. */
    s_copy(word, "TNT", (ftnlen)3, (ftnlen)3);
    } else {
    s_copy(word, "---", (ftnlen)3, (ftnlen)3);
    }
    if (*iprint >= 99) {
    s_wsle(&io___195);
    do_lio(&c__9, &c__1, "LINE SEARCH", (ftnlen)11);
    do_lio(&c__3, &c__1, (char *)&(*iback), (ftnlen)sizeof(integer));
    do_lio(&c__9, &c__1, " times; norm of step = ", (ftnlen)23);
    do_lio(&c__5, &c__1, (char *)&(*xstep), (ftnlen)sizeof(doublereal));
    e_wsle();
    s_wsfe(&io___196);
    do_fio(&c__1, (char *)&(*iter), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*f), (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&(*sbgnrm), (ftnlen)sizeof(doublereal));
    e_wsfe();
    if (*iprint > 100) {
        s_wsfe(&io___197);
        do_fio(&c__1, "X =", (ftnlen)3);
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
        do_fio(&c__1, (char *)&x[i__], (ftnlen)sizeof(doublereal));
        }
        e_wsfe();
        s_wsfe(&io___199);
        do_fio(&c__1, "G =", (ftnlen)3);
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
        do_fio(&c__1, (char *)&g[i__], (ftnlen)sizeof(doublereal));
        }
        e_wsfe();
    }
    } else if (*iprint > 0) {
    imod = *iter % *iprint;
    if (imod == 0) {
        s_wsfe(&io___201);
        do_fio(&c__1, (char *)&(*iter), (ftnlen)sizeof(integer));
        do_fio(&c__1, (char *)&(*f), (ftnlen)sizeof(doublereal));
        do_fio(&c__1, (char *)&(*sbgnrm), (ftnlen)sizeof(doublereal));
        e_wsfe();
    }
    }
    if (*iprint >= 1) {
    io___202.ciunit = *itfile;
    s_wsfe(&io___202);
    do_fio(&c__1, (char *)&(*iter), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*nfgv), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*nint), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*nact), (ftnlen)sizeof(integer));
    do_fio(&c__1, word, (ftnlen)3);
    do_fio(&c__1, (char *)&(*iback), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*stp), (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&(*xstep), (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&(*sbgnrm), (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&(*f), (ftnlen)sizeof(doublereal));
    e_wsfe();
    }
#endif
    return 0;
} /* prn2lb_ */

/* ======================= The end of prn2lb ============================= */
/* Subroutine */
static int prn3lb_( integer *n, doublereal *x, doublereal *f, char *task,
integer *iprint, integer *info, integer *itfile, integer *iter, integer *nfgv, integer *nintol, integer *nskip, integer *nact,
doublereal *sbgnrm, doublereal *time, integer *nint, char *word, integer *iback,
doublereal *stp, doublereal *xstep, integer *k,
doublereal *cachyt, doublereal *sbtime, doublereal *lnscht, ftnlen task_len,
ftnlen word_len)
{
  (void)n;
  (void)x;
  (void)f;
  (void)task;
  (void)iprint;
  (void)info;
  (void)itfile;
  (void)iter;
  (void)nfgv;
  (void)nintol;
  (void)nskip;
  (void)nact;
  (void)sbgnrm;
  (void)time;
  (void)nint;
  (void)word;
  (void)iback;
  (void)stp;
  (void)xstep;
  (void)k;
  (void)cachyt;
  (void)sbtime;
  (void)lnscht;
  (void)task_len;
  (void)word_len;
#if 0
    /* Format strings */
    static char fmt_3003[] = "(/,\002           * * *\002,/,/,\002Tit   = to\
tal number of iterations\002,/,\002Tnf   = total number of function evaluati\
ons\002,/,\002Tnint = total number of segments explored during\002,\002 Cauc\
hy searches\002,/,\002Skip  = number of BFGS updates skipped\002,/,\002Nact \
 = number of active bounds at final generalized\002,\002 Cauchy point\002,/\
,\002Projg = norm of the final projected gradient\002,/,\002F     = final fu\
nction value\002,/,/,\002           * * *\002)";
    static char fmt_3004[] = "(/,3x,\002N\002,3x,\002Tit\002,2x,\002Tnf\002,\
2x,\002Tnint\002,2x,\002Skip\002,2x,\002Nact\002,5x,\002Projg\002,8x,\002\
F\002)";
    static char fmt_3005[] = "(i5,2(1x,i4),(1x,i6),(2x,i4),(1x,i5),1p,2(2x,d\
10.3))";
    static char fmt_1004[] = "(/,a4,1p,6(1x,d11.4),/,(4x,1p,6(1x,d11.4)))";
    static char fmt_3009[] = "(/,a60)";
    static char fmt_9011[] = "(/,\002 Matrix in 1st Cholesky factorization i\
n formk is not Pos. Def.\002)";
    static char fmt_9012[] = "(/,\002 Matrix in 2st Cholesky factorization i\
n formk is not Pos. Def.\002)";
    static char fmt_9013[] = "(/,\002 Matrix in the Cholesky factorization i\
n formt is not Pos. Def.\002)";
    static char fmt_9014[] = "(/,\002 Derivative >= 0, backtracking line sea\
rch impossible.\002,/,\002   Previous x, f and g restored.\002,/,\002 Possib\
le causes: 1 error in function or gradient evaluation;\002,/,\002           \
       2 rounding errors dominate computation.\002)";
    static char fmt_9015[] = "(/,\002 Warning:  more than 10 function and gr\
adient\002,/,\002   evaluations in the last line search.  Termination\002,/\
,\002   may possibly be caused by a bad search direction.\002)";
    static char fmt_9018[] = "(/,\002 The triangular system is singular.\002)"
        ;
    static char fmt_9019[] = "(/,\002 Line search cannot locate an adequate \
point after 20 function\002,/,\002  and gradient evaluations.  Previous x, f\
 and g restored.\002,/,\002 Possible causes: 1 error in function or gradient\
 evaluation;\002,/,\002                  2 rounding error dominate computati\
on.\002)";
    static char fmt_3007[] = "(/,\002 Cauchy                time\002,1p,e10.\
3,\002 seconds.\002,/\002 Subspace minimization time\002,1p,e10.3,\002 secon\
ds.\002,/\002 Line search           time\002,1p,e10.3,\002 seconds.\002)";
    static char fmt_3008[] = "(/,\002 Total User time\002,1p,e10.3,\002 seco\
nds.\002,/)";
    static char fmt_3002[] = "(2(1x,i4),2(1x,i5),2x,a3,1x,i4,1p,2(2x,d7.1),6\
x,\002-\002,10x,\002-\002)";

    /* System generated locals */
    integer i__1;

    /* Local variables */
    static integer i__;

    /* Fortran I/O blocks */
    static cilist io___203 = { 0, 6, 0, fmt_3003, 0 };
    static cilist io___204 = { 0, 6, 0, fmt_3004, 0 };
    static cilist io___205 = { 0, 6, 0, fmt_3005, 0 };
    static cilist io___206 = { 0, 6, 0, fmt_1004, 0 };
    static cilist io___208 = { 0, 6, 0, 0, 0 };
    static cilist io___209 = { 0, 6, 0, fmt_3009, 0 };
    static cilist io___210 = { 0, 6, 0, fmt_9011, 0 };
    static cilist io___211 = { 0, 6, 0, fmt_9012, 0 };
    static cilist io___212 = { 0, 6, 0, fmt_9013, 0 };
    static cilist io___213 = { 0, 6, 0, fmt_9014, 0 };
    static cilist io___214 = { 0, 6, 0, fmt_9015, 0 };
    static cilist io___215 = { 0, 6, 0, 0, 0 };
    static cilist io___216 = { 0, 6, 0, 0, 0 };
    static cilist io___217 = { 0, 6, 0, fmt_9018, 0 };
    static cilist io___218 = { 0, 6, 0, fmt_9019, 0 };
    static cilist io___219 = { 0, 6, 0, fmt_3007, 0 };
    static cilist io___220 = { 0, 6, 0, fmt_3008, 0 };
    static cilist io___221 = { 0, 0, 0, fmt_3002, 0 };
    static cilist io___222 = { 0, 0, 0, fmt_3009, 0 };
    static cilist io___223 = { 0, 0, 0, fmt_9011, 0 };
    static cilist io___224 = { 0, 0, 0, fmt_9012, 0 };
    static cilist io___225 = { 0, 0, 0, fmt_9013, 0 };
    static cilist io___226 = { 0, 0, 0, fmt_9014, 0 };
    static cilist io___227 = { 0, 0, 0, fmt_9015, 0 };
    static cilist io___228 = { 0, 0, 0, fmt_9018, 0 };
    static cilist io___229 = { 0, 0, 0, fmt_9019, 0 };
    static cilist io___230 = { 0, 0, 0, fmt_3008, 0 };


/*     ************ */

/*     Subroutine prn3lb */

/*     This subroutine prints out information when either a built-in */
/*       convergence test is satisfied or when an error message is */
/*       generated. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    --x;

    /* Function Body */
    if (s_cmp(task, "ERROR", (ftnlen)5, (ftnlen)5) == 0) {
    goto L999;
    }
    if (*iprint >= 0) {
    s_wsfe(&io___203);
    e_wsfe();
    s_wsfe(&io___204);
    e_wsfe();
    s_wsfe(&io___205);
    do_fio(&c__1, (char *)&(*n), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*iter), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*nfgv), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*nintol), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*nskip), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*nact), (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*sbgnrm), (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&(*f), (ftnlen)sizeof(doublereal));
    e_wsfe();
    if (*iprint >= 100) {
        s_wsfe(&io___206);
        do_fio(&c__1, "X =", (ftnlen)3);
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
        do_fio(&c__1, (char *)&x[i__], (ftnlen)sizeof(doublereal));
        }
        e_wsfe();
    }
    if (*iprint >= 1) {
        s_wsle(&io___208);
        do_lio(&c__9, &c__1, " F =", (ftnlen)4);
        do_lio(&c__5, &c__1, (char *)&(*f), (ftnlen)sizeof(doublereal));
        e_wsle();
    }
    }
L999:
    if (*iprint >= 0) {
    s_wsfe(&io___209);
    do_fio(&c__1, task, (ftnlen)60);
    e_wsfe();
    if (*info != 0) {
        if (*info == -1) {
        s_wsfe(&io___210);
        e_wsfe();
        }
        if (*info == -2) {
        s_wsfe(&io___211);
        e_wsfe();
        }
        if (*info == -3) {
        s_wsfe(&io___212);
        e_wsfe();
        }
        if (*info == -4) {
        s_wsfe(&io___213);
        e_wsfe();
        }
        if (*info == -5) {
        s_wsfe(&io___214);
        e_wsfe();
        }
        if (*info == -6) {
        s_wsle(&io___215);
        do_lio(&c__9, &c__1, " Input nbd(", (ftnlen)11);
        do_lio(&c__3, &c__1, (char *)&(*k), (ftnlen)sizeof(integer));
        do_lio(&c__9, &c__1, ") is invalid.", (ftnlen)13);
        e_wsle();
        }
        if (*info == -7) {
        s_wsle(&io___216);
        do_lio(&c__9, &c__1, " l(", (ftnlen)3);
        do_lio(&c__3, &c__1, (char *)&(*k), (ftnlen)sizeof(integer));
        do_lio(&c__9, &c__1, ") > u(", (ftnlen)6);
        do_lio(&c__3, &c__1, (char *)&(*k), (ftnlen)sizeof(integer));
        do_lio(&c__9, &c__1, ").  No feasible solution.", (ftnlen)25);
        e_wsle();
        }
        if (*info == -8) {
        s_wsfe(&io___217);
        e_wsfe();
        }
        if (*info == -9) {
        s_wsfe(&io___218);
        e_wsfe();
        }
    }
    if (*iprint >= 1) {
        s_wsfe(&io___219);
        do_fio(&c__1, (char *)&(*cachyt), (ftnlen)sizeof(doublereal));
        do_fio(&c__1, (char *)&(*sbtime), (ftnlen)sizeof(doublereal));
        do_fio(&c__1, (char *)&(*lnscht), (ftnlen)sizeof(doublereal));
        e_wsfe();
    }
    s_wsfe(&io___220);
    do_fio(&c__1, (char *)&(*time), (ftnlen)sizeof(doublereal));
    e_wsfe();
    if (*iprint >= 1) {
        if (*info == -4 || *info == -9) {
        io___221.ciunit = *itfile;
        s_wsfe(&io___221);
        do_fio(&c__1, (char *)&(*iter), (ftnlen)sizeof(integer));
        do_fio(&c__1, (char *)&(*nfgv), (ftnlen)sizeof(integer));
        do_fio(&c__1, (char *)&(*nint), (ftnlen)sizeof(integer));
        do_fio(&c__1, (char *)&(*nact), (ftnlen)sizeof(integer));
        do_fio(&c__1, word, (ftnlen)3);
        do_fio(&c__1, (char *)&(*iback), (ftnlen)sizeof(integer));
        do_fio(&c__1, (char *)&(*stp), (ftnlen)sizeof(doublereal));
        do_fio(&c__1, (char *)&(*xstep), (ftnlen)sizeof(doublereal));
        e_wsfe();
        }
        io___222.ciunit = *itfile;
        s_wsfe(&io___222);
        do_fio(&c__1, task, (ftnlen)60);
        e_wsfe();
        if (*info != 0) {
        if (*info == -1) {
            io___223.ciunit = *itfile;
            s_wsfe(&io___223);
            e_wsfe();
        }
        if (*info == -2) {
            io___224.ciunit = *itfile;
            s_wsfe(&io___224);
            e_wsfe();
        }
        if (*info == -3) {
            io___225.ciunit = *itfile;
            s_wsfe(&io___225);
            e_wsfe();
        }
        if (*info == -4) {
            io___226.ciunit = *itfile;
            s_wsfe(&io___226);
            e_wsfe();
        }
        if (*info == -5) {
            io___227.ciunit = *itfile;
            s_wsfe(&io___227);
            e_wsfe();
        }
        if (*info == -8) {
            io___228.ciunit = *itfile;
            s_wsfe(&io___228);
            e_wsfe();
        }
        if (*info == -9) {
            io___229.ciunit = *itfile;
            s_wsfe(&io___229);
            e_wsfe();
        }
        }
        io___230.ciunit = *itfile;
        s_wsfe(&io___230);
        do_fio(&c__1, (char *)&(*time), (ftnlen)sizeof(doublereal));
        e_wsfe();
    }
    }
/* L3006: */
#endif
    return 0;
} /* prn3lb_ */

/* ======================= The end of prn3lb ============================= */
/* Subroutine */
static int projgr_( integer *n, doublereal *l, doublereal *u, integer *nbd,
doublereal *x, doublereal *g, doublereal *sbgnrm)
{
    /* System generated locals */
    integer i__1;
    doublereal d__1, d__2;

    /* Local variables */
    static integer i__;
    static doublereal gi;

/*     ************ */

/*     Subroutine projgr */

/*     This subroutine computes the infinity norm of the projected */
/*       gradient. */


/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    --g;
    --x;
    --nbd;
    --u;
    --l;

    /* Function Body */
    *sbgnrm = 0.;
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
    gi = g[i__];
    if (nbd[i__] != 0) {
        if (gi < 0.) {
        if (nbd[i__] >= 2) {
/* Computing MAX */
            d__1 = x[i__] - u[i__];
            gi = max(d__1,gi);
        }
        } else {
        if (nbd[i__] <= 2) {
/* Computing MIN */
            d__1 = x[i__] - l[i__];
            gi = min(d__1,gi);
        }
        }
    }
/* Computing MAX */
    d__1 = *sbgnrm, d__2 = abs(gi);
    *sbgnrm = max(d__1,d__2);
/* L15: */
    }
    return 0;
} /* projgr_ */

/* ======================= The end of projgr ============================= */
/* Subroutine */
static int subsm_( integer *n, integer *m, integer *nsub, integer *ind,
doublereal *l, doublereal *u, integer *nbd,
doublereal *x, doublereal *d__, doublereal *ws, doublereal *wy, doublereal *theta,
integer *col, integer *head, integer *iword,
doublereal *wv, doublereal *wn, integer *iprint, integer *info)
{
    /* Format strings */
/*
    static char fmt_1001[] = "(/,\002----------------SUBSM entered----------\
-------\002,/)";
    static char fmt_1002[] = "(\002ALPHA = \002,f7.5,\002 backtrack to the B\
OX\002)";
    static char fmt_1003[] = "(\002Subspace solution X =  \002,/,(4x,1p,6(1x\
,d11.4)))";
    static char fmt_1004[] = "(/,\002----------------exit SUBSM ------------\
--------\002,/)";
*/

    /* System generated locals */
    integer ws_dim1, ws_offset, wy_dim1, wy_offset, wn_dim1, wn_offset, i__1,
        i__2;

    /* Local variables */
    static doublereal temp1, temp2;
    static integer i__, j, k;
    static doublereal alpha;
    static integer m2;
    static doublereal dk;
    static integer js, jy, pointr, ibd, col2;

    /* Fortran I/O blocks */
/*
    static cilist io___233 = { 0, 6, 0, fmt_1001, 0 };
    static cilist io___247 = { 0, 6, 0, fmt_1002, 0 };
    static cilist io___248 = { 0, 6, 0, 0, 0 };
    static cilist io___249 = { 0, 6, 0, fmt_1003, 0 };
    static cilist io___250 = { 0, 6, 0, fmt_1004, 0 };
*/


/*     ************ */

/*     Subroutine subsm */

/*     Given xcp, l, u, r, an index set that specifies */
/*     the active set at xcp, and an l-BFGS matrix B */
/*     (in terms of WY, WS, SY, WT, head, col, and theta), */
/*     this subroutine computes an approximate solution */
/*     of the subspace problem */

/*         (P)   min Q(x) = r'(x-xcp) + 1/2 (x-xcp)' B (x-xcp) */

/*             subject to l<=x<=u */
/*                   x_i=xcp_i for all i in A(xcp) */

/*     along the subspace unconstrained Newton direction */

/*        d = -(Z'BZ)^(-1) r. */

/*       The formula for the Newton direction, given the L-BFGS matrix */
/*       and the Sherman-Morrison formula, is */

/*        d = (1/theta)r + (1/theta*2) Z'WK^(-1)W'Z r. */

/*       where */
/*                 K = [-D -Y'ZZ'Y/theta     L_a'-R_z'  ] */
/*                     [L_a -R_z           theta*S'AA'S ] */

/*     Note that this procedure for computing d differs */
/*     from that described in [1]. One can show that the matrix K is */
/*     equal to the matrix M^[-1]N in that paper. */

/*     n is an integer variable. */
/*       On entry n is the dimension of the problem. */
/*       On exit n is unchanged. */

/*     m is an integer variable. */
/*       On entry m is the maximum number of variable metric corrections */
/*         used to define the limited memory matrix. */
/*       On exit m is unchanged. */

/*     nsub is an integer variable. */
/*       On entry nsub is the number of free variables. */
/*       On exit nsub is unchanged. */

/*     ind is an integer array of dimension nsub. */
/*       On entry ind specifies the coordinate indices of free variables. */
/*       On exit ind is unchanged. */

/*     l is a double precision array of dimension n. */
/*       On entry l is the lower bound of x. */
/*       On exit l is unchanged. */

/*     u is a double precision array of dimension n. */
/*       On entry u is the upper bound of x. */
/*       On exit u is unchanged. */

/*     nbd is a integer array of dimension n. */
/*       On entry nbd represents the type of bounds imposed on the */
/*         variables, and must be specified as follows: */
/*         nbd(i)=0 if x(i) is unbounded, */
/*                1 if x(i) has only a lower bound, */
/*                2 if x(i) has both lower and upper bounds, and */
/*                3 if x(i) has only an upper bound. */
/*       On exit nbd is unchanged. */

/*     x is a double precision array of dimension n. */
/*       On entry x specifies the Cauchy point xcp. */
/*       On exit x(i) is the minimizer of Q over the subspace of */
/*                                                        free variables. */

/*     d is a double precision array of dimension n. */
/*       On entry d is the reduced gradient of Q at xcp. */
/*       On exit d is the Newton direction of Q. */

/*     ws and wy are double precision arrays; */
/*     theta is a double precision variable; */
/*     col is an integer variable; */
/*     head is an integer variable. */
/*       On entry they store the information defining the */
/*                                          limited memory BFGS matrix: */
/*         ws(n,m) stores S, a set of s-vectors; */
/*         wy(n,m) stores Y, a set of y-vectors; */
/*         theta is the scaling factor specifying B_0 = theta I; */
/*         col is the number of variable metric corrections stored; */
/*         head is the location of the 1st s- (or y-) vector in S (or Y). */
/*       On exit they are unchanged. */

/*     iword is an integer variable. */
/*       On entry iword is unspecified. */
/*       On exit iword specifies the status of the subspace solution. */
/*         iword = 0 if the solution is in the box, */
/*                 1 if some bound is encountered. */

/*     wv is a double precision working array of dimension 2m. */

/*     wn is a double precision array of dimension 2m x 2m. */
/*       On entry the upper triangle of wn stores the LEL^T factorization */
/*         of the indefinite matrix */

/*              K = [-D -Y'ZZ'Y/theta     L_a'-R_z'  ] */
/*                  [L_a -R_z           theta*S'AA'S ] */
/*                                                    where E = [-I  0] */
/*                                                              [ 0  I] */
/*       On exit wn is unchanged. */

/*     iprint is an INTEGER variable that must be set by the user. */
/*       It controls the frequency and type of output generated: */
/*        iprint<0    no output is generated; */
/*        iprint=0    print only one line at the last iteration; */
/*        0<iprint<99 print also f and |proj g| every iprint iterations; */
/*        iprint=99   print details of every iteration except n-vectors; */
/*        iprint=100  print also the changes of active set and final x; */
/*        iprint>100  print details of every iteration including x and g; */
/*       When iprint > 0, the file iterate.dat will be created to */
/*                        summarize the iteration. */

/*     info is an integer variable. */
/*       On entry info is unspecified. */
/*       On exit info = 0       for normal return, */
/*                    = nonzero for abnormal return */
/*                                  when the matrix K is ill-conditioned. */

/*     Subprograms called: */

/*       Linpack dtrsl. */


/*     References: */

/*       [1] R. H. Byrd, P. Lu, J. Nocedal and C. Zhu, ``A limited */
/*       memory algorithm for bound constrained optimization'', */
/*       SIAM J. Scientific Computing 16 (1995), no. 5, pp. 1190--1208. */



/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    --d__;
    --x;
    --nbd;
    --u;
    --l;
    wn_dim1 = 2 * *m;
    wn_offset = 1 + wn_dim1 * 1;
    wn -= wn_offset;
    --wv;
    wy_dim1 = *n;
    wy_offset = 1 + wy_dim1 * 1;
    wy -= wy_offset;
    ws_dim1 = *n;
    ws_offset = 1 + ws_dim1 * 1;
    ws -= ws_offset;
    --ind;

    /* Function Body */
    if (*nsub <= 0) {
    return 0;
    }
    if (*iprint >= 99) {
/*
    s_wsfe(&io___233);
    e_wsfe();
*/
    }
/*     Compute wv = W'Zd. */
    pointr = *head;
    i__1 = *col;
    for (i__ = 1; i__ <= i__1; ++i__) {
    temp1 = 0.;
    temp2 = 0.;
    i__2 = *nsub;
    for (j = 1; j <= i__2; ++j) {
        k = ind[j];
        temp1 += wy[k + pointr * wy_dim1] * d__[j];
        temp2 += ws[k + pointr * ws_dim1] * d__[j];
/* L10: */
    }
    wv[i__] = temp1;
    wv[*col + i__] = *theta * temp2;
    pointr = pointr % *m + 1;
/* L20: */
    }
/*     Compute wv:=K^(-1)wv. */
    m2 = *m << 1;
    col2 = *col << 1;
    dtrsl_(&wn[wn_offset], &m2, &col2, &wv[1], &c__11, info);
    if (*info != 0) {
    return 0;
    }
    i__1 = *col;
    for (i__ = 1; i__ <= i__1; ++i__) {
    wv[i__] = -wv[i__];
/* L25: */
    }
    dtrsl_(&wn[wn_offset], &m2, &col2, &wv[1], &c__1, info);
    if (*info != 0) {
    return 0;
    }
/*     Compute d = (1/theta)d + (1/theta**2)Z'W wv. */
    pointr = *head;
    i__1 = *col;
    for (jy = 1; jy <= i__1; ++jy) {
    js = *col + jy;
    i__2 = *nsub;
    for (i__ = 1; i__ <= i__2; ++i__) {
        k = ind[i__];
        d__[i__] = d__[i__] + wy[k + pointr * wy_dim1] * wv[jy] / *theta
            + ws[k + pointr * ws_dim1] * wv[js];
/* L30: */
    }
    pointr = pointr % *m + 1;
/* L40: */
    }
    i__1 = *nsub;
    for (i__ = 1; i__ <= i__1; ++i__) {
    d__[i__] /= *theta;
/* L50: */
    }
/*     Backtrack to the feasible region. */
    alpha = 1.;
    temp1 = alpha;
    i__1 = *nsub;
    for (i__ = 1; i__ <= i__1; ++i__) {
    k = ind[i__];
    dk = d__[i__];
    if (nbd[k] != 0) {
        if (dk < 0. && nbd[k] <= 2) {
        temp2 = l[k] - x[k];
        if (temp2 >= 0.) {
            temp1 = 0.;
        } else if (dk * alpha < temp2) {
            temp1 = temp2 / dk;
        }
        } else if (dk > 0. && nbd[k] >= 2) {
        temp2 = u[k] - x[k];
        if (temp2 <= 0.) {
            temp1 = 0.;
        } else if (dk * alpha > temp2) {
            temp1 = temp2 / dk;
        }
        }
        if (temp1 < alpha) {
        alpha = temp1;
        ibd = i__;
        }
    }
/* L60: */
    }
    if (alpha < 1.) {
    dk = d__[ibd];
    k = ind[ibd];
    if (dk > 0.) {
        x[k] = u[k];
        d__[ibd] = 0.;
    } else if (dk < 0.) {
        x[k] = l[k];
        d__[ibd] = 0.;
    }
    }
    i__1 = *nsub;
    for (i__ = 1; i__ <= i__1; ++i__) {
    k = ind[i__];
    x[k] += alpha * d__[i__];
/* L70: */
    }
    if (*iprint >= 99) {
    if (alpha < 1.) {
/*
        s_wsfe(&io___247);
        do_fio(&c__1, (char *)&alpha, (ftnlen)sizeof(doublereal));
        e_wsfe();
*/
    } else {
/*
        s_wsle(&io___248);
        do_lio(&c__9, &c__1, "SM solution inside the box", (ftnlen)26);
        e_wsle();
*/
    }
    if (*iprint > 100) {
/*
        s_wsfe(&io___249);
        i__1 = *n;
        for (i__ = 1; i__ <= i__1; ++i__) {
        do_fio(&c__1, (char *)&x[i__], (ftnlen)sizeof(doublereal));
        }
        e_wsfe();
*/
    }
    }
    if (alpha < 1.) {
    *iword = 1;
    } else {
    *iword = 0;
    }
    if (*iprint >= 99) {
/*
    s_wsfe(&io___250);
    e_wsfe();
*/
    }
    return 0;
} /* subsm_ */

/* ====================== The end of subsm =============================== */
/* Subroutine */
static int dcsrch_(
doublereal *f, doublereal *g, doublereal *stp, doublereal *ftol, doublereal *gtol, doublereal *xtol, doublereal *stpmin, doublereal *stpmax,
char *task, integer *isave, doublereal *dsave, ftnlen task_len)
{
    /* System generated locals */
    doublereal d__1;

    /* Local variables */
    static integer stage;
    static doublereal finit, ginit, width, ftest, gtest, stmin, stmax, width1,
         fm, gm, fx, fy, gx, gy;
    static logical brackt;
    static doublereal fxm, fym, gxm, gym, stx, sty;

/*     ********** */

/*     Subroutine dcsrch */

/*     This subroutine finds a step that satisfies a sufficient */
/*     decrease condition and a curvature condition. */

/*     Each call of the subroutine updates an interval with */
/*     endpoints stx and sty. The interval is initially chosen */
/*     so that it contains a minimizer of the modified function */

/*           psi(stp) = f(stp) - f(0) - ftol*stp*f'(0). */

/*     If psi(stp) <= 0 and f'(stp) >= 0 for some step, then the */
/*     interval is chosen so that it contains a minimizer of f. */

/*     The algorithm is designed to find a step that satisfies */
/*     the sufficient decrease condition */

/*           f(stp) <= f(0) + ftol*stp*f'(0), */

/*     and the curvature condition */

/*           abs(f'(stp)) <= gtol*abs(f'(0)). */

/*     If ftol is less than gtol and if, for example, the function */
/*     is bounded below, then there is always a step which satisfies */
/*     both conditions. */

/*     If no step can be found that satisfies both conditions, then */
/*     the algorithm stops with a warning. In this case stp only */
/*     satisfies the sufficient decrease condition. */

/*     A typical invocation of dcsrch has the following outline: */

/*     task = 'START' */
/*  10 continue */
/*        call dcsrch( ... ) */
/*        if (task .eq. 'FG') then */
/*           Evaluate the function and the gradient at stp */
/*           goto 10 */
/*           end if */

/*     NOTE: The user must no alter work arrays between calls. */

/*     The subroutine statement is */

/*        subroutine dcsrch(f,g,stp,ftol,gtol,xtol,stpmin,stpmax, */
/*                          task,isave,dsave) */
/*     where */

/*       f is a double precision variable. */
/*         On initial entry f is the value of the function at 0. */
/*            On subsequent entries f is the value of the */
/*            function at stp. */
/*         On exit f is the value of the function at stp. */

/*     g is a double precision variable. */
/*         On initial entry g is the derivative of the function at 0. */
/*            On subsequent entries g is the derivative of the */
/*            function at stp. */
/*         On exit g is the derivative of the function at stp. */

/*     stp is a double precision variable. */
/*         On entry stp is the current estimate of a satisfactory */
/*            step. On initial entry, a positive initial estimate */
/*            must be provided. */
/*         On exit stp is the current estimate of a satisfactory step */
/*            if task = 'FG'. If task = 'CONV' then stp satisfies */
/*            the sufficient decrease and curvature condition. */

/*       ftol is a double precision variable. */
/*         On entry ftol specifies a nonnegative tolerance for the */
/*            sufficient decrease condition. */
/*         On exit ftol is unchanged. */

/*       gtol is a double precision variable. */
/*         On entry gtol specifies a nonnegative tolerance for the */
/*            curvature condition. */
/*         On exit gtol is unchanged. */

/*     xtol is a double precision variable. */
/*         On entry xtol specifies a nonnegative relative tolerance */
/*            for an acceptable step. The subroutine exits with a */
/*            warning if the relative difference between sty and stx */
/*            is less than xtol. */
/*         On exit xtol is unchanged. */

/*     stpmin is a double precision variable. */
/*         On entry stpmin is a nonnegative lower bound for the step. */
/*         On exit stpmin is unchanged. */

/*     stpmax is a double precision variable. */
/*         On entry stpmax is a nonnegative upper bound for the step. */
/*         On exit stpmax is unchanged. */

/*       task is a character variable of length at least 60. */
/*         On initial entry task must be set to 'START'. */
/*         On exit task indicates the required action: */

/*            If task(1:2) = 'FG' then evaluate the function and */
/*            derivative at stp and call dcsrch again. */

/*            If task(1:4) = 'CONV' then the search is successful. */

/*            If task(1:4) = 'WARN' then the subroutine is not able */
/*            to satisfy the convergence conditions. The exit value of */
/*            stp contains the best point found during the search. */

/*            If task(1:5) = 'ERROR' then there is an error in the */
/*            input arguments. */

/*         On exit with convergence, a warning or an error, the */
/*            variable task contains additional information. */

/*       isave is an integer work array of dimension 2. */

/*       dsave is a double precision work array of dimension 13. */

/*     Subprograms called */

/*     MINPACK-2 ... dcstep */

/*     MINPACK-1 Project. June 1983. */
/*     Argonne National Laboratory. */
/*     Jorge J. More' and David J. Thuente. */

/*     MINPACK-2 Project. October 1993. */
/*     Argonne National Laboratory and University of Minnesota. */
/*     Brett M. Averick, Richard G. Carter, and Jorge J. More'. */

/*     ********** */
/*     Initialization block. */
    /* Parameter adjustments */
    --dsave;
    --isave;

    /* Function Body */
    if (s_cmp(task, "START", (ftnlen)5, (ftnlen)5) == 0) {
/*        Check the input arguments for errors. */
    if (*stp < *stpmin) {
        s_copy(task, "ERROR: STP .LT. STPMIN", task_len, (ftnlen)22);
    }
    if (*stp > *stpmax) {
        s_copy(task, "ERROR: STP .GT. STPMAX", task_len, (ftnlen)22);
    }
    if (*g >= 0.) {
        s_copy(task, "ERROR: INITIAL G .GE. ZERO", task_len, (ftnlen)26);
    }
    if (*ftol < 0.) {
        s_copy(task, "ERROR: FTOL .LT. ZERO", task_len, (ftnlen)21);
    }
    if (*gtol < 0.) {
        s_copy(task, "ERROR: GTOL .LT. ZERO", task_len, (ftnlen)21);
    }
    if (*xtol < 0.) {
        s_copy(task, "ERROR: XTOL .LT. ZERO", task_len, (ftnlen)21);
    }
    if (*stpmin < 0.) {
        s_copy(task, "ERROR: STPMIN .LT. ZERO", task_len, (ftnlen)23);
    }
    if (*stpmax < *stpmin) {
        s_copy(task, "ERROR: STPMAX .LT. STPMIN", task_len, (ftnlen)25);
    }
/*        Exit if there are errors on input. */
    if (s_cmp(task, "ERROR", (ftnlen)5, (ftnlen)5) == 0) {
        return 0;
    }
/*        Initialize local variables. */
    brackt = FALSE_;
    stage = 1;
    finit = *f;
    ginit = *g;
    gtest = *ftol * ginit;
    width = *stpmax - *stpmin;
    width1 = width / .5;
/*        The variables stx, fx, gx contain the values of the step, */
/*        function, and derivative at the best step. */
/*        The variables sty, fy, gy contain the value of the step, */
/*        function, and derivative at sty. */
/*        The variables stp, f, g contain the values of the step, */
/*        function, and derivative at stp. */
    stx = 0.;
    fx = finit;
    gx = ginit;
    sty = 0.;
    fy = finit;
    gy = ginit;
    stmin = 0.;
    stmax = *stp + *stp * 4.;
    s_copy(task, "FG", task_len, (ftnlen)2);
    goto L1000;
    } else {
/*        Restore local variables. */
    if (isave[1] == 1) {
        brackt = TRUE_;
    } else {
        brackt = FALSE_;
    }
    stage = isave[2];
    ginit = dsave[1];
    gtest = dsave[2];
    gx = dsave[3];
    gy = dsave[4];
    finit = dsave[5];
    fx = dsave[6];
    fy = dsave[7];
    stx = dsave[8];
    sty = dsave[9];
    stmin = dsave[10];
    stmax = dsave[11];
    width = dsave[12];
    width1 = dsave[13];
    }
/*     If psi(stp) <= 0 and f'(stp) >= 0 for some step, then the */
/*     algorithm enters the second stage. */
    ftest = finit + *stp * gtest;
    if (stage == 1 && *f <= ftest && *g >= 0.) {
    stage = 2;
    }
/*     Test for warnings. */
    if (brackt && (*stp <= stmin || *stp >= stmax)) {
    s_copy(task, "WARNING: ROUNDING ERRORS PREVENT PROGRESS", task_len, (
        ftnlen)41);
    }
    if (brackt && stmax - stmin <= *xtol * stmax) {
    s_copy(task, "WARNING: XTOL TEST SATISFIED", task_len, (ftnlen)28);
    }
    if (*stp == *stpmax && *f <= ftest && *g <= gtest) {
    s_copy(task, "WARNING: STP = STPMAX", task_len, (ftnlen)21);
    }
    if (*stp == *stpmin && (*f > ftest || *g >= gtest)) {
    s_copy(task, "WARNING: STP = STPMIN", task_len, (ftnlen)21);
    }
/*     Test for convergence. */
    if (*f <= ftest && abs(*g) <= *gtol * (-ginit)) {
    s_copy(task, "CONVERGENCE", task_len, (ftnlen)11);
    }
/*     Test for termination. */
    if (s_cmp(task, "WARN", (ftnlen)4, (ftnlen)4) == 0 || s_cmp(task, "CONV",
        (ftnlen)4, (ftnlen)4) == 0) {
    goto L1000;
    }
/*     A modified function is used to predict the step during the */
/*     first stage if a lower function value has been obtained but */
/*     the decrease is not sufficient. */
    if (stage == 1 && *f <= fx && *f > ftest) {
/*        Define the modified function and derivative values. */
    fm = *f - *stp * gtest;
    fxm = fx - stx * gtest;
    fym = fy - sty * gtest;
    gm = *g - gtest;
    gxm = gx - gtest;
    gym = gy - gtest;
/*        Call dcstep to update stx, sty, and to compute the new step. */
    dcstep_(&stx, &fxm, &gxm, &sty, &fym, &gym, stp, &fm, &gm, &brackt, &
        stmin, &stmax);
/*        Reset the function and derivative values for f. */
    fx = fxm + stx * gtest;
    fy = fym + sty * gtest;
    gx = gxm + gtest;
    gy = gym + gtest;
    } else {
/*       Call dcstep to update stx, sty, and to compute the new step. */
    dcstep_(&stx, &fx, &gx, &sty, &fy, &gy, stp, f, g, &brackt, &stmin, &
        stmax);
    }
/*     Decide if a bisection step is needed. */
    if (brackt) {
    if ((d__1 = sty - stx, abs(d__1)) >= width1 * .66) {
        *stp = stx + (sty - stx) * .5;
    }
    width1 = width;
    width = (d__1 = sty - stx, abs(d__1));
    }
/*     Set the minimum and maximum steps allowed for stp. */
    if (brackt) {
    stmin = min(stx,sty);
    stmax = max(stx,sty);
    } else {
    stmin = *stp + (*stp - stx) * 1.1;
    stmax = *stp + (*stp - stx) * 4.;
    }
/*     Force the step to be within the bounds stpmax and stpmin. */
    *stp = max(*stp,*stpmin);
    *stp = min(*stp,*stpmax);
/*     If further progress is not possible, let stp be the best */
/*     point obtained during the search. */
    if (   ( brackt && (*stp <= stmin || *stp >= stmax) )
        || ( brackt && (stmax - stmin <= *xtol * stmax) ) ) {
    *stp = stx;
    }
/*     Obtain another function and derivative. */
    s_copy(task, "FG", task_len, (ftnlen)2);
L1000:
/*     Save local variables. */
    if (brackt) {
    isave[1] = 1;
    } else {
    isave[1] = 0;
    }
    isave[2] = stage;
    dsave[1] = ginit;
    dsave[2] = gtest;
    dsave[3] = gx;
    dsave[4] = gy;
    dsave[5] = finit;
    dsave[6] = fx;
    dsave[7] = fy;
    dsave[8] = stx;
    dsave[9] = sty;
    dsave[10] = stmin;
    dsave[11] = stmax;
    dsave[12] = width;
    dsave[13] = width1;

  return 0;

} /* dcsrch_ */

/* ====================== The end of dcsrch ============================== */
/* Subroutine */
static int dcstep_( doublereal *stx, doublereal *fx, doublereal *dx,
    doublereal *sty, doublereal *fy, doublereal *dy, doublereal *stp, doublereal *fp, doublereal *dp,
    logical *brackt, doublereal *stpmin, doublereal *stpmax)
{
    /* System generated locals */
    doublereal d__1, d__2, d__3;

    /* Local variables */
    static doublereal sgnd, stpc, stpf, stpq, p, q, gamma, r__, s, theta;

/*     ********** */

/*     Subroutine dcstep */

/*     This subroutine computes a safeguarded step for a search */
/*     procedure and updates an interval that contains a step that */
/*     satisfies a sufficient decrease and a curvature condition. */

/*     The parameter stx contains the step with the least function */
/*     value. If brackt is set to .true. then a minimizer has */
/*     been bracketed in an interval with endpoints stx and sty. */
/*     The parameter stp contains the current step. */
/*     The subroutine assumes that if brackt is set to .true. then */

/*           min(stx,sty) < stp < max(stx,sty), */

/*     and that the derivative at stx is negative in the direction */
/*     of the step. */

/*     The subroutine statement is */

/*       subroutine dcstep(stx,fx,dx,sty,fy,dy,stp,fp,dp,brackt, */
/*                         stpmin,stpmax) */

/*     where */

/*       stx is a double precision variable. */
/*         On entry stx is the best step obtained so far and is an */
/*            endpoint of the interval that contains the minimizer. */
/*         On exit stx is the updated best step. */

/*       fx is a double precision variable. */
/*         On entry fx is the function at stx. */
/*         On exit fx is the function at stx. */

/*       dx is a double precision variable. */
/*         On entry dx is the derivative of the function at */
/*            stx. The derivative must be negative in the direction of */
/*            the step, that is, dx and stp - stx must have opposite */
/*            signs. */
/*         On exit dx is the derivative of the function at stx. */

/*       sty is a double precision variable. */
/*         On entry sty is the second endpoint of the interval that */
/*            contains the minimizer. */
/*         On exit sty is the updated endpoint of the interval that */
/*            contains the minimizer. */

/*       fy is a double precision variable. */
/*         On entry fy is the function at sty. */
/*         On exit fy is the function at sty. */

/*       dy is a double precision variable. */
/*         On entry dy is the derivative of the function at sty. */
/*         On exit dy is the derivative of the function at the exit sty. */

/*       stp is a double precision variable. */
/*         On entry stp is the current step. If brackt is set to .true. */
/*            then on input stp must be between stx and sty. */
/*         On exit stp is a new trial step. */

/*       fp is a double precision variable. */
/*         On entry fp is the function at stp */
/*         On exit fp is unchanged. */

/*       dp is a double precision variable. */
/*         On entry dp is the the derivative of the function at stp. */
/*         On exit dp is unchanged. */

/*       brackt is an logical variable. */
/*         On entry brackt specifies if a minimizer has been bracketed. */
/*            Initially brackt must be set to .false. */
/*         On exit brackt specifies if a minimizer has been bracketed. */
/*            When a minimizer is bracketed brackt is set to .true. */

/*       stpmin is a double precision variable. */
/*         On entry stpmin is a lower bound for the step. */
/*         On exit stpmin is unchanged. */

/*       stpmax is a double precision variable. */
/*         On entry stpmax is an upper bound for the step. */
/*         On exit stpmax is unchanged. */

/*     MINPACK-1 Project. June 1983 */
/*     Argonne National Laboratory. */
/*     Jorge J. More' and David J. Thuente. */

/*     MINPACK-2 Project. October 1993. */
/*     Argonne National Laboratory and University of Minnesota. */
/*     Brett M. Averick and Jorge J. More'. */

/*     ********** */
    sgnd = *dp * (*dx / abs(*dx));
/*     First case: A higher function value. The minimum is bracketed. */
/*     If the cubic step is closer to stx than the quadratic step, the */
/*     cubic step is taken, otherwise the average of the cubic and */
/*     quadratic steps is taken. */
    if (*fp > *fx) {
    theta = (*fx - *fp) * 3. / (*stp - *stx) + *dx + *dp;
/* Computing MAX */
    d__1 = abs(theta), d__2 = abs(*dx), d__1 = max(d__1,d__2), d__2 = abs(
        *dp);
    s = max(d__1,d__2);
/* Computing 2nd power */
    d__1 = theta / s;
    gamma = s * sqrt(d__1 * d__1 - *dx / s * (*dp / s));
    if (*stp < *stx) {
        gamma = -gamma;
    }
    p = gamma - *dx + theta;
    q = gamma - *dx + gamma + *dp;
    r__ = p / q;
    stpc = *stx + r__ * (*stp - *stx);
    stpq = *stx + *dx / ((*fx - *fp) / (*stp - *stx) + *dx) / 2. * (*stp
        - *stx);
    if ((d__1 = stpc - *stx, abs(d__1)) < (d__2 = stpq - *stx, abs(d__2)))
         {
        stpf = stpc;
    } else {
        stpf = stpc + (stpq - stpc) / 2.;
    }
    *brackt = TRUE_;
/*     Second case: A lower function value and derivatives of opposite */
/*     sign. The minimum is bracketed. If the cubic step is farther from */
/*     stp than the secant step, the cubic step is taken, otherwise the */
/*     secant step is taken. */
    } else if (sgnd < 0.) {
    theta = (*fx - *fp) * 3. / (*stp - *stx) + *dx + *dp;
/* Computing MAX */
    d__1 = abs(theta), d__2 = abs(*dx), d__1 = max(d__1,d__2), d__2 = abs(
        *dp);
    s = max(d__1,d__2);
/* Computing 2nd power */
    d__1 = theta / s;
    gamma = s * sqrt(d__1 * d__1 - *dx / s * (*dp / s));
    if (*stp > *stx) {
        gamma = -gamma;
    }
    p = gamma - *dp + theta;
    q = gamma - *dp + gamma + *dx;
    r__ = p / q;
    stpc = *stp + r__ * (*stx - *stp);
    stpq = *stp + *dp / (*dp - *dx) * (*stx - *stp);
    if ((d__1 = stpc - *stp, abs(d__1)) > (d__2 = stpq - *stp, abs(d__2)))
         {
        stpf = stpc;
    } else {
        stpf = stpq;
    }
    *brackt = TRUE_;
/*     Third case: A lower function value, derivatives of the same sign, */
/*     and the magnitude of the derivative decreases. */
    } else if (abs(*dp) < abs(*dx)) {
/*        The cubic step is computed only if the cubic tends to infinity */
/*        in the direction of the step or if the minimum of the cubic */
/*        is beyond stp. Otherwise the cubic step is defined to be the */
/*        secant step. */
    theta = (*fx - *fp) * 3. / (*stp - *stx) + *dx + *dp;
/* Computing MAX */
    d__1 = abs(theta), d__2 = abs(*dx), d__1 = max(d__1,d__2), d__2 = abs(
        *dp);
    s = max(d__1,d__2);
/*        The case gamma = 0 only arises if the cubic does not tend */
/*        to infinity in the direction of the step. */
/* Computing MAX */
/* Computing 2nd power */
    d__3 = theta / s;
    d__1 = 0., d__2 = d__3 * d__3 - *dx / s * (*dp / s);
    gamma = s * sqrt((max(d__1,d__2)));
    if (*stp > *stx) {
        gamma = -gamma;
    }
    p = gamma - *dp + theta;
    q = gamma + (*dx - *dp) + gamma;
    r__ = p / q;
    if (r__ < 0. && gamma != 0.) {
        stpc = *stp + r__ * (*stx - *stp);
    } else if (*stp > *stx) {
        stpc = *stpmax;
    } else {
        stpc = *stpmin;
    }
    stpq = *stp + *dp / (*dp - *dx) * (*stx - *stp);
    if (*brackt) {
/*           A minimizer has been bracketed. If the cubic step is */
/*           closer to stp than the secant step, the cubic step is */
/*           taken, otherwise the secant step is taken. */
        if ((d__1 = stpc - *stp, abs(d__1)) < (d__2 = stpq - *stp, abs(
            d__2))) {
        stpf = stpc;
        } else {
        stpf = stpq;
        }
        if (*stp > *stx) {
/* Computing MIN */
        d__1 = *stp + (*sty - *stp) * .66;
        stpf = min(d__1,stpf);
        } else {
/* Computing MAX */
        d__1 = *stp + (*sty - *stp) * .66;
        stpf = max(d__1,stpf);
        }
    } else {
/*           A minimizer has not been bracketed. If the cubic step is */
/*           farther from stp than the secant step, the cubic step is */
/*           taken, otherwise the secant step is taken. */
        if ((d__1 = stpc - *stp, abs(d__1)) > (d__2 = stpq - *stp, abs(
            d__2))) {
        stpf = stpc;
        } else {
        stpf = stpq;
        }
        stpf = min(*stpmax,stpf);
        stpf = max(*stpmin,stpf);
    }
/*     Fourth case: A lower function value, derivatives of the same sign, */
/*     and the magnitude of the derivative does not decrease. If the */
/*     minimum is not bracketed, the step is either stpmin or stpmax, */
/*     otherwise the cubic step is taken. */
    } else {
    if (*brackt) {
        theta = (*fp - *fy) * 3. / (*sty - *stp) + *dy + *dp;
/* Computing MAX */
        d__1 = abs(theta), d__2 = abs(*dy), d__1 = max(d__1,d__2), d__2 =
            abs(*dp);
        s = max(d__1,d__2);
/* Computing 2nd power */
        d__1 = theta / s;
        gamma = s * sqrt(d__1 * d__1 - *dy / s * (*dp / s));
        if (*stp > *sty) {
        gamma = -gamma;
        }
        p = gamma - *dp + theta;
        q = gamma - *dp + gamma + *dy;
        r__ = p / q;
        stpc = *stp + r__ * (*sty - *stp);
        stpf = stpc;
    } else if (*stp > *stx) {
        stpf = *stpmax;
    } else {
        stpf = *stpmin;
    }
    }
/*     Update the interval which contains a minimizer. */
    if (*fp > *fx) {
    *sty = *stp;
    *fy = *fp;
    *dy = *dp;
    } else {
    if (sgnd < 0.) {
        *sty = *stx;
        *fy = *fx;
        *dy = *dx;
    }
    *stx = *stp;
    *fx = *fp;
    *dx = *dp;
    }
/*     Compute the new step. */
    *stp = stpf;

  return 0;

} /* dcstep_ */

/* ====================== The end of dcstep ============================== */

/* ====================== The end of dnrm2 =============================== */
static doublereal dpmeps_(void)
{
    /* Initialized data */

    static doublereal zero = 0.;
    static doublereal one = 1.;
    static doublereal two = 2.;

    /* System generated locals */
    integer i__1;
    doublereal ret_val;

    /* Local variables */
    static doublereal beta;
    static integer irnd;
    static doublereal temp, temp1, a, b;
    static integer i__;
    static doublereal betah;
    static integer ibeta, negep;
    static doublereal tempa;
    static integer itemp, it;
    static doublereal betain;

/*     ********** */

/*     Subroutine dpeps */

/*     This subroutine computes the machine precision parameter */
/*     dpmeps as the smallest floating point number such that */
/*     1 + dpmeps differs from 1. */

/*     This subroutine is based on the subroutine machar described in */

/*     W. J. Cody, */
/*     MACHAR: A subroutine to dynamically determine machine parameters, */
/*     ACM Transactions on Mathematical Software, 14, 1988, pages 303-311. */

/*     The subroutine statement is: */

/*       subroutine dpeps(dpmeps) */

/*     where */

/*       dpmeps is a double precision variable. */
/*         On entry dpmeps need not be specified. */
/*         On exit dpmeps is the machine precision. */

/*     MINPACK-2 Project. February 1991. */
/*     Argonne National Laboratory and University of Minnesota. */
/*     Brett M. Averick. */

/*     ******* */
/*     determine ibeta, beta ala malcolm. */
    a = one;
    b = one;
L10:
    a += a;
    temp = a + one;
    temp1 = temp - a;
    if (temp1 - one == zero) {
    goto L10;
    }
L20:
    b += b;
    temp = a + b;
    itemp = (integer) (temp - a);
    if (itemp == 0) {
    goto L20;
    }
    ibeta = itemp;
    beta = (doublereal) ibeta;
/*     determine it, irnd. */
    it = 0;
    b = one;
L30:
    ++it;
    b *= beta;
    temp = b + one;
    temp1 = temp - b;
    if (temp1 - one == zero) {
    goto L30;
    }
    irnd = 0;
    betah = beta / two;
    temp = a + betah;
    if (temp - a != zero) {
    irnd = 1;
    }
    tempa = a + beta;
    temp = tempa + betah;
    if (irnd == 0 && temp - tempa != zero) {
    irnd = 2;
    }
/*     determine dpmeps. */
    negep = it + 3;
    betain = one / beta;
    a = one;
    i__1 = negep;
    for (i__ = 1; i__ <= i__1; ++i__) {
    a *= betain;
/* L40: */
    }
L50:
    temp = one + a;
    if (temp - one != zero) {
    goto L60;
    }
    a *= beta;
    goto L50;
L60:
    ret_val = a;
    if (ibeta == 2 || irnd == 0) {
    goto L70;
    }
    a = a * (one + a) / two;
    temp = one + a;
    if (temp - one != zero) {
    ret_val = a;
    }
L70:
    return ret_val;
} /* dpmeps_ */

/* ====================== The end of dpmeps ============================== */

/* Subroutine */
static int dtrsl_( doublereal *t, integer *ldt, integer *n,
doublereal *b, integer *job, integer *info)
{
    /* System generated locals */
    integer t_dim1, t_offset, i__1, i__2;

    /* Local variables */
    static integer case__;
    static doublereal temp;
    static integer j;
    static integer jj;



/*     dtrsl solves systems of the form */

/*                   t * x = b */
/*     or */
/*                   trans(t) * x = b */

/*     where t is a triangular matrix of order n. here trans(t) */
/*     denotes the transpose of the matrix t. */

/*     on entry */

/*         t         double precision(ldt,n) */
/*                   t contains the matrix of the system. the zero */
/*                   elements of the matrix are not referenced, and */
/*                   the corresponding elements of the array can be */
/*                   used to store other information. */

/*         ldt       integer */
/*                   ldt is the leading dimension of the array t. */

/*         n         integer */
/*                   n is the order of the system. */

/*         b         double precision(n). */
/*                   b contains the right hand side of the system. */

/*         job       integer */
/*                   job specifies what kind of system is to be solved. */
/*                   if job is */

/*                        00   solve t*x=b, t lower triangular, */
/*                        01   solve t*x=b, t upper triangular, */
/*                        10   solve trans(t)*x=b, t lower triangular, */
/*                        11   solve trans(t)*x=b, t upper triangular. */

/*     on return */

/*         b         b contains the solution, if info .eq. 0. */
/*                   otherwise b is unaltered. */

/*         info      integer */
/*                   info contains zero if the system is nonsingular. */
/*                   otherwise info contains the index of */
/*                   the first zero diagonal element of t. */

/*     linpack. this version dated 08/14/78 . */
/*     g. w. stewart, university of maryland, argonne national lab. */

/*     subroutines and functions */

/*     blas daxpy,ddot */
/*     fortran mod */

/*     internal variables */


/*     begin block permitting ...exits to 150 */

/*        check for zero diagonal elements. */

    /* Parameter adjustments */
    t_dim1 = *ldt;
    t_offset = 1 + t_dim1 * 1;
    t -= t_offset;
    --b;

    /* Function Body */
    i__1 = *n;
    for (*info = 1; *info <= i__1; ++(*info)) {
/*     ......exit */
    if (t[*info + *info * t_dim1] == 0.) {
        goto L150;
    }
/* L10: */
    }
    *info = 0;

/*        determine the task and go to it. */

    case__ = 1;
    if (*job % 10 != 0) {
    case__ = 2;
    }
    if (*job % 100 / 10 != 0) {
    case__ += 2;
    }
    switch ((int)case__) {
    case 1:  goto L20;
    case 2:  goto L50;
    case 3:  goto L80;
    case 4:  goto L110;
    }

/*        solve t*x=b for t lower triangular */

L20:
    b[1] /= t[t_dim1 + 1];
    if (*n < 2) {
    goto L40;
    }
    i__1 = *n;
    for (j = 2; j <= i__1; ++j) {
    temp = -b[j - 1];
    i__2 = *n - j + 1;
    daxpy_(&i__2, &temp, &t[j + (j - 1) * t_dim1], &c__1, &b[j], &c__1);
    b[j] /= t[j + j * t_dim1];
/* L30: */
    }
L40:
    goto L140;

/*        solve t*x=b for t upper triangular. */

L50:
    b[*n] /= t[*n + *n * t_dim1];
    if (*n < 2) {
    goto L70;
    }
    i__1 = *n;
    for (jj = 2; jj <= i__1; ++jj) {
    j = *n - jj + 1;
    temp = -b[j + 1];
    daxpy_(&j, &temp, &t[(j + 1) * t_dim1 + 1], &c__1, &b[1], &c__1);
    b[j] /= t[j + j * t_dim1];
/* L60: */
    }
L70:
    goto L140;

/*        solve trans(t)*x=b for t lower triangular. */

L80:
    b[*n] /= t[*n + *n * t_dim1];
    if (*n < 2) {
    goto L100;
    }
    i__1 = *n;
    for (jj = 2; jj <= i__1; ++jj) {
    j = *n - jj + 1;
    i__2 = jj - 1;
    b[j] -= ddot_(&i__2, &t[j + 1 + j * t_dim1], &c__1, &b[j + 1], &c__1);
    b[j] /= t[j + j * t_dim1];
/* L90: */
    }
L100:
    goto L140;

/*        solve trans(t)*x=b for t upper triangular. */

L110:
    b[1] /= t[t_dim1 + 1];
    if (*n < 2) {
    goto L130;
    }
    i__1 = *n;
    for (j = 2; j <= i__1; ++j) {
    i__2 = j - 1;
    b[j] -= ddot_(&i__2, &t[j * t_dim1 + 1], &c__1, &b[1], &c__1);
    b[j] /= t[j + j * t_dim1];
/* L120: */
    }
L130:
L140:
L150:
    return 0;
} /* dtrsl_ */

/* Subroutine */
static int mainlb_ (integer *n, integer *m, doublereal *x, doublereal *l,
      doublereal *u, integer *nbd, doublereal *f, doublereal *g,
      doublereal *factr, doublereal *pgtol, doublereal *ws, doublereal *wy,
      doublereal *sy, doublereal *ss, doublereal *yy, doublereal *wt,
      doublereal *wn, doublereal *snd, doublereal *z__, doublereal *r__,
      doublereal *d__, doublereal *t, doublereal *wa, doublereal *sg,
      doublereal *sgo, doublereal *yg, doublereal *ygo, integer *index,
      integer *iwhere, integer *indx2, char *task, integer *iprint, char *csave,
      logical *lsave, integer *isave, doublereal *dsave, ftnlen task_len,
      ftnlen csave_len)
{
    /* Format strings */
/*
    static char fmt_1002[] = "(/,\002At iterate\002,i5,4x,\002f= \002,1p,d12\
.5,4x,\002|proj g|= \002,1p,d12.5)";
    static char fmt_1003[] = "(2(1x,i4),5x,\002-\002,5x,\002-\002,3x,\002\
-\002,5x,\002-\002,5x,\002-\002,8x,\002-\002,3x,1p,2(1x,d10.3))";
    static char fmt_1001[] = "(//,\002ITERATION \002,i5)";
    static char fmt_1005[] = "(/,\002 Singular triangular system detected\
;\002,/,\002   refresh the lbfgs memory and restart the iteration.\002)";
    static char fmt_1006[] = "(/,\002 Nonpositive definiteness in Cholesky f\
actorization in formk;\002,/,\002   refresh the lbfgs memory and restart the\
 iteration.\002)";
    static char fmt_1008[] = "(/,\002 Bad direction in the line search;\002,\
/,\002   refresh the lbfgs memory and restart the iteration.\002)";
    static char fmt_1004[] = "(\002  ys=\002,1p,e10.3,\002  -gs=\002,1p,e10.\
3,\002 BFGS update SKIPPED\002)";
    static char fmt_1007[] = "(/,\002 Nonpositive definiteness in Cholesky f\
actorization in formt;\002,/,\002   refresh the lbfgs memory and restart the\
 iteration.\002)";
*/

    /* System generated locals */
    integer ws_dim1, ws_offset, wy_dim1, wy_offset, sy_dim1, sy_offset,
        ss_dim1, ss_offset, yy_dim1, yy_offset, wt_dim1, wt_offset,
        wn_dim1, wn_offset, snd_dim1, snd_offset, i__1;
    doublereal d__1, d__2;
/*    olist o__1; */

 /*   integer f_open(), s_wsfe(), do_fio(), e_wsfe(); */

    /* Local variables */
    static integer head;
    static doublereal fold;
    static integer nact;
    static doublereal ddum;
    static integer info;
    static doublereal time;
    static integer nfgv, ifun, iter, nint;
    static char word[3];
    static doublereal time1, time2;
    static integer i__, iback, k;
    static doublereal gdold;
    static integer nfree;
    static logical boxed;
    static integer itail;
    static doublereal theta;
    static doublereal dnorm;
    static integer nskip, iword;
    static doublereal xstep, stpmx;
    static doublereal gd, dr, rr;
    static integer ileave;
    static integer itfile;
    static doublereal cachyt, epsmch;
    static logical updatd;
    static doublereal sbtime;
    static logical prjctd;
    static integer iupdat;
    static logical cnstnd;
    static doublereal sbgnrm;
    static integer nenter;
    static doublereal lnscht;
    static integer nintol;
    static doublereal dtd;
    static integer col;
    static doublereal tol;
    static logical wrk;
    static doublereal stp, cpu1, cpu2;

    /* Fortran I/O blocks */
/*
    static cilist io___62 = { 0, 6, 0, fmt_1002, 0 };
    static cilist io___63 = { 0, 0, 0, fmt_1003, 0 };
    static cilist io___64 = { 0, 6, 0, fmt_1001, 0 };
    static cilist io___66 = { 0, 6, 0, fmt_1005, 0 };
    static cilist io___68 = { 0, 6, 0, fmt_1006, 0 };
    static cilist io___69 = { 0, 6, 0, fmt_1005, 0 };
    static cilist io___71 = { 0, 6, 0, fmt_1008, 0 };
    static cilist io___75 = { 0, 6, 0, fmt_1004, 0 };
    static cilist io___76 = { 0, 6, 0, fmt_1007, 0 };
*/
    (void)task_len;
    (void)csave_len;

/*     ************ */

/*     Subroutine mainlb */

/*     This subroutine solves bound constrained optimization problems by */
/*       using the compact formula of the limited memory BFGS updates. */

/*     n is an integer variable. */
/*       On entry n is the number of variables. */
/*       On exit n is unchanged. */

/*     m is an integer variable. */
/*       On entry m is the maximum number of variable metric */
/*          corrections allowed in the limited memory matrix. */
/*       On exit m is unchanged. */

/*     x is a double precision array of dimension n. */
/*       On entry x is an approximation to the solution. */
/*       On exit x is the current approximation. */

/*     l is a double precision array of dimension n. */
/*       On entry l is the lower bound of x. */
/*       On exit l is unchanged. */

/*     u is a double precision array of dimension n. */
/*       On entry u is the upper bound of x. */
/*       On exit u is unchanged. */

/*     nbd is an integer array of dimension n. */
/*       On entry nbd represents the type of bounds imposed on the */
/*         variables, and must be specified as follows: */
/*         nbd(i)=0 if x(i) is unbounded, */
/*                1 if x(i) has only a lower bound, */
/*                2 if x(i) has both lower and upper bounds, */
/*                3 if x(i) has only an upper bound. */
/*       On exit nbd is unchanged. */

/*     f is a double precision variable. */
/*       On first entry f is unspecified. */
/*       On final exit f is the value of the function at x. */

/*     g is a double precision array of dimension n. */
/*       On first entry g is unspecified. */
/*       On final exit g is the value of the gradient at x. */

/*     factr is a double precision variable. */
/*       On entry factr >= 0 is specified by the user.  The iteration */
/*         will stop when */

/*         (f^k - f^{k+1})/max{|f^k|,|f^{k+1}|,1} <= factr*epsmch */

/*         where epsmch is the machine precision, which is automatically */
/*         generated by the code. */
/*       On exit factr is unchanged. */

/*     pgtol is a double precision variable. */
/*       On entry pgtol >= 0 is specified by the user.  The iteration */
/*         will stop when */

/*                 max{|proj g_i | i = 1, ..., n} <= pgtol */

/*         where pg_i is the ith component of the projected gradient. */
/*       On exit pgtol is unchanged. */

/*     ws, wy, sy, and wt are double precision working arrays used to */
/*       store the following information defining the limited memory */
/*          BFGS matrix: */
/*          ws, of dimension n x m, stores S, the matrix of s-vectors; */
/*          wy, of dimension n x m, stores Y, the matrix of y-vectors; */
/*          sy, of dimension m x m, stores S'Y; */
/*          ss, of dimension m x m, stores S'S; */
/*        yy, of dimension m x m, stores Y'Y; */
/*          wt, of dimension m x m, stores the Cholesky factorization */
/*                                  of (theta*S'S+LD^(-1)L'); see eq. */
/*                                  (2.26) in [3]. */

/*     wn is a double precision working array of dimension 2m x 2m */
/*       used to store the LEL^T factorization of the indefinite matrix */
/*                 K = [-D -Y'ZZ'Y/theta     L_a'-R_z'  ] */
/*                     [L_a -R_z           theta*S'AA'S ] */

/*       where     E = [-I  0] */
/*                     [ 0  I] */

/*     snd is a double precision working array of dimension 2m x 2m */
/*       used to store the lower triangular part of */
/*                 N = [Y' ZZ'Y   L_a'+R_z'] */
/*                     [L_a +R_z  S'AA'S   ] */

/*     z(n),r(n),d(n),t(n),wa(8*m) are double precision working arrays. */
/*       z is used at different times to store the Cauchy point and */
/*       the Newton point. */

/*     sg(m),sgo(m),yg(m),ygo(m) are double precision working arrays. */

/*     index is an integer working array of dimension n. */
/*       In subroutine freev, index is used to store the free and fixed */
/*          variables at the Generalized Cauchy Point (GCP). */

/*     iwhere is an integer working array of dimension n used to record */
/*       the status of the vector x for GCP computation. */
/*       iwhere(i)=0 or -3 if x(i) is free and has bounds, */
/*                 1       if x(i) is fixed at l(i), and l(i) .ne. u(i) */
/*                 2       if x(i) is fixed at u(i), and u(i) .ne. l(i) */
/*                 3       if x(i) is always fixed, i.e.,  u(i)=x(i)=l(i) */
/*                -1       if x(i) is always free, i.e., no bounds on it. */

/*     indx2 is an integer working array of dimension n. */
/*       Within subroutine cauchy, indx2 corresponds to the array iorder. */
/*       In subroutine freev, a list of variables entering and leaving */
/*       the free set is stored in indx2, and it is passed on to */
/*       subroutine formk with this information. */

/*     task is a working string of characters of length 60 indicating */
/*       the current job when entering and leaving this subroutine. */

/*     iprint is an INTEGER variable that must be set by the user. */
/*       It controls the frequency and type of output generated: */
/*        iprint<0    no output is generated; */
/*        iprint=0    print only one line at the last iteration; */
/*        0<iprint<99 print also f and |proj g| every iprint iterations; */
/*        iprint=99   print details of every iteration except n-vectors; */
/*        iprint=100  print also the changes of active set and final x; */
/*        iprint>100  print details of every iteration including x and g; */
/*       When iprint > 0, the file iterate.dat will be created to */
/*                        summarize the iteration. */

/*     csave is a working string of characters of length 60. */

/*     lsave is a logical working array of dimension 4. */

/*     isave is an integer working array of dimension 23. */

/*     dsave is a double precision working array of dimension 29. */


/*     Subprograms called */

/*       L-BFGS-B Library ... cauchy, subsm, lnsrlb, formk, */

/*        errclb, prn1lb, prn2lb, prn3lb, active, projgr, */

/*        freev, cmprlb, matupd, formt. */

/*       Minpack2 Library ... timer, dpmeps. */

/*       Linpack Library ... dcopy, ddot. */


/*     References: */

/*       [1] R. H. Byrd, P. Lu, J. Nocedal and C. Zhu, ``A limited */
/*       memory algorithm for bound constrained optimization'', */
/*       SIAM J. Scientific Computing 16 (1995), no. 5, pp. 1190--1208. */

/*       [2] C. Zhu, R.H. Byrd, P. Lu, J. Nocedal, ``L-BFGS-B: FORTRAN */
/*       Subroutines for Large Scale Bound Constrained Optimization'' */
/*       Tech. Report, NAM-11, EECS Department, Northwestern University, */
/*       1994. */

/*       [3] R. Byrd, J. Nocedal and R. Schnabel "Representations of */
/*       Quasi-Newton Matrices and their use in Limited Memory Methods'', */
/*       Mathematical Programming 63 (1994), no. 4, pp. 129-156. */

/*       (Postscript files of these papers are available via anonymous */
/*        ftp to eecs.nwu.edu in the directory pub/lbfgs/lbfgs_bcm.) */

/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    --indx2;
    --iwhere;
    --index;
    --t;
    --d__;
    --r__;
    --z__;
    --g;
    --nbd;
    --u;
    --l;
    --x;
    --ygo;
    --yg;
    --sgo;
    --sg;
    --wa;
    snd_dim1 = 2 * *m;
    snd_offset = 1 + snd_dim1 * 1;
    snd -= snd_offset;
    wn_dim1 = 2 * *m;
    wn_offset = 1 + wn_dim1 * 1;
    wn -= wn_offset;
    wt_dim1 = *m;
    wt_offset = 1 + wt_dim1 * 1;
    wt -= wt_offset;
    yy_dim1 = *m;
    yy_offset = 1 + yy_dim1 * 1;
    yy -= yy_offset;
    ss_dim1 = *m;
    ss_offset = 1 + ss_dim1 * 1;
    ss -= ss_offset;
    sy_dim1 = *m;
    sy_offset = 1 + sy_dim1 * 1;
    sy -= sy_offset;
    wy_dim1 = *n;
    wy_offset = 1 + wy_dim1 * 1;
    wy -= wy_offset;
    ws_dim1 = *n;
    ws_offset = 1 + ws_dim1 * 1;
    ws -= ws_offset;
    --lsave;
    --isave;
    --dsave;

    /* Function Body */
    if (s_cmp(task, "START", (ftnlen)60, (ftnlen)5) == 0) {
/*        Generate the current machine precision. */
    epsmch = dpmeps_();
/*        Initialize counters and scalars when task='START'. */
/*           for the limited memory BFGS matrices: */
    col = 0;
    head = 1;
    theta = 1.;
    iupdat = 0;
    updatd = FALSE_;
/*           for operation counts: */
    iter = 0;
    nfgv = 0;
    nint = 0;
    nintol = 0;
    nskip = 0;
    nfree = *n;
/*           for stopping tolerance: */
    tol = *factr * epsmch;
/*           for measuring running time: */
    cachyt = 0.;
    sbtime = 0.;
    lnscht = 0.;
/*           'word' records the status of subspace solutions. */
    s_copy(word, "---", (ftnlen)3, (ftnlen)3);
/*           'info' records the termination information. */
    info = 0;
    if (*iprint >= 1) {
/*                                open a summary file 'iterate.dat' */
/*
        o__1.oerr = 0;
        o__1.ounit = 8;
        o__1.ofnmlen = 11;
        o__1.ofnm = "iterate.dat";
        o__1.orl = 0;
        o__1.osta = "unknown";
        o__1.oacc = 0;
        o__1.ofm = 0;
        o__1.oblnk = 0;
        f_open(&o__1);
        itfile = 8;
*/
    }
/*        Check the input arguments for errors. */
    errclb_(n, m, factr, &l[1], &u[1], &nbd[1], task, &info, &k, (ftnlen)
        60);
    if (s_cmp(task, "ERROR", (ftnlen)5, (ftnlen)5) == 0) {
        prn3lb_(n, &x[1], f, task, iprint, &info, &itfile, &iter, &nfgv, &
            nintol, &nskip, &nact, &sbgnrm, &c_b9, &nint, word, &
            iback, &stp, &xstep, &k, &cachyt, &sbtime, &lnscht, (
            ftnlen)60, (ftnlen)3);
        return 0;
    }
    prn1lb_(n, m, &l[1], &u[1], &x[1], iprint, &itfile, &epsmch);
/*        Initialize iwhere & project x onto the feasible set. */
    active_(n, &l[1], &u[1], &nbd[1], &x[1], &iwhere[1], iprint, &prjctd,
        &cnstnd, &boxed);
/*        The end of the initialization. */
    } else {
/*          restore local variables. */
    prjctd = lsave[1];
    cnstnd = lsave[2];
    boxed = lsave[3];
    updatd = lsave[4];
    nintol = isave[1];
    itfile = isave[3];
    iback = isave[4];
    nskip = isave[5];
    head = isave[6];
    col = isave[7];
    itail = isave[8];
    iter = isave[9];
    iupdat = isave[10];
    nint = isave[12];
    nfgv = isave[13];
    info = isave[14];
    ifun = isave[15];
    iword = isave[16];
    nfree = isave[17];
    nact = isave[18];
    ileave = isave[19];
    nenter = isave[20];
    theta = dsave[1];
    fold = dsave[2];
    tol = dsave[3];
    dnorm = dsave[4];
    epsmch = dsave[5];
    cpu1 = dsave[6];
    cachyt = dsave[7];
    sbtime = dsave[8];
    lnscht = dsave[9];
    time1 = dsave[10];
    gd = dsave[11];
    stpmx = dsave[12];
    sbgnrm = dsave[13];
    stp = dsave[14];
    gdold = dsave[15];
    dtd = dsave[16];
/*        After returning from the driver go to the point where execution */
/*        is to resume. */
    if (s_cmp(task, "FG_LN", (ftnlen)5, (ftnlen)5) == 0) {
        goto L666;
    }
    if (s_cmp(task, "NEW_X", (ftnlen)5, (ftnlen)5) == 0) {
        goto L777;
    }
    if (s_cmp(task, "FG_ST", (ftnlen)5, (ftnlen)5) == 0) {
        goto L111;
    }
    if (s_cmp(task, "STOP", (ftnlen)4, (ftnlen)4) == 0) {
        if (s_cmp(task + 6, "CPU", (ftnlen)3, (ftnlen)3) == 0) {
/*                                          restore the previous iterate. */
        dcopy_(n, &t[1], &c__1, &x[1], &c__1);
        dcopy_(n, &r__[1], &c__1, &g[1], &c__1);
        *f = fold;
        }
        goto L999;
    }
    }
/*     Compute f0 and g0. */
    s_copy(task, "FG_START", (ftnlen)60, (ftnlen)8);
/*          return to the driver to calculate f and g; reenter at 111. */
    goto L1000;
L111:
    nfgv = 1;
/*     Compute the infinity norm of the (-) projected gradient. */
    projgr_(n, &l[1], &u[1], &nbd[1], &x[1], &g[1], &sbgnrm);
    if (*iprint >= 1) {
/*
    s_wsfe(&io___62);
    do_fio(&c__1, (char *)&iter, (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&(*f), (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&sbgnrm, (ftnlen)sizeof(doublereal));
    e_wsfe();
    io___63.ciunit = itfile;
    s_wsfe(&io___63);
    do_fio(&c__1, (char *)&iter, (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&nfgv, (ftnlen)sizeof(integer));
    do_fio(&c__1, (char *)&sbgnrm, (ftnlen)sizeof(doublereal));
    do_fio(&c__1, (char *)&(*f), (ftnlen)sizeof(doublereal));
    e_wsfe();
*/
    }
    if (sbgnrm <= *pgtol) {
/*                                terminate the algorithm. */
    s_copy(task, "CONVERGENCE: NORM OF PROJECTED GRADIENT <= PGTOL", (
        ftnlen)60, (ftnlen)48);
    goto L999;
    }
/* ----------------- the beginning of the loop -------------------------- */
L222:
    if (*iprint >= 99) {
/*
    s_wsfe(&io___64);
    i__1 = iter + 1;
    do_fio(&c__1, (char *)&i__1, (ftnlen)sizeof(integer));
    e_wsfe();
*/
    }
    iword = -1;

    if (! cnstnd && col > 0) {
/*                                            skip the search for GCP. */
    dcopy_(n, &x[1], &c__1, &z__[1], &c__1);
    wrk = updatd;
    nint = 0;
    goto L333;
    }
/* ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc */

/*     Compute the Generalized Cauchy Point (GCP). */

/* ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc */
    cauchy_(n, &x[1], &l[1], &u[1], &nbd[1], &g[1], &indx2[1], &iwhere[1], &t[
        1], &d__[1], &z__[1], m, &wy[wy_offset], &ws[ws_offset], &sy[
        sy_offset], &wt[wt_offset], &theta, &col, &head, &wa[1], &wa[(*m
        << 1) + 1], &wa[(*m << 2) + 1], &wa[*m * 6 + 1], &nint, &sg[1], &
        yg[1], iprint, &sbgnrm, &info, &epsmch);
    if (info != 0) {
/*         singular triangular system detected; refresh the lbfgs memory. */
    if (*iprint >= 1) {
/*
        s_wsfe(&io___66);
        e_wsfe();
*/
    }
    info = 0;
    col = 0;
    head = 1;
    theta = 1.;
    iupdat = 0;
    updatd = FALSE_;
    cachyt = cachyt + cpu2 - cpu1;
    goto L222;
    }
    cachyt = cachyt + cpu2 - cpu1;
    nintol += nint;
/*     Count the entering and leaving variables for iter > 0; */
/*     find the index set of free and active variables at the GCP. */
    freev_(n, &nfree, &index[1], &nenter, &ileave, &indx2[1], &iwhere[1], &
        wrk, &updatd, &cnstnd, iprint, &iter);
    nact = *n - nfree;
L333:
/*     If there are no free variables or B=theta*I, then */
/*                                        skip the subspace minimization. */
    if (nfree == 0 || col == 0) {
    goto L555;
    }
/* ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc */

/*     Subspace minimization. */

/* ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc */
/*     Form  the LEL^T factorization of the indefinite */
/*       matrix    K = [-D -Y'ZZ'Y/theta     L_a'-R_z'  ] */
/*                     [L_a -R_z           theta*S'AA'S ] */
/*       where     E = [-I  0] */
/*                     [ 0  I] */
    if (wrk) {
    formk_(n, &nfree, &index[1], &nenter, &ileave, &indx2[1], &iupdat, &
        updatd, &wn[wn_offset], &snd[snd_offset], m, &ws[ws_offset], &
        wy[wy_offset], &sy[sy_offset], &theta, &col, &head, &info);
    }
    if (info != 0) {
/*          nonpositive definiteness in Cholesky factorization; */
/*          refresh the lbfgs memory and restart the iteration. */
    if (*iprint >= 1) {
/*
        s_wsfe(&io___68);
        e_wsfe();
*/
    }
    info = 0;
    col = 0;
    head = 1;
    theta = 1.;
    iupdat = 0;
    updatd = FALSE_;
    sbtime = sbtime + cpu2 - cpu1;
    goto L222;
    }
/*        compute r=-Z'B(xcp-xk)-Z'g (using wa(2m+1)=W'(xcp-x) */
/*                                                   from 'cauchy'). */
    cmprlb_(n, m, &x[1], &g[1], &ws[ws_offset], &wy[wy_offset], &sy[sy_offset]
        , &wt[wt_offset], &z__[1], &r__[1], &wa[1], &index[1], &theta, &
        col, &head, &nfree, &cnstnd, &info);
    if (info != 0) {
    goto L444;
    }
/*       call the direct method. */
    subsm_(n, m, &nfree, &index[1], &l[1], &u[1], &nbd[1], &z__[1], &r__[1], &
        ws[ws_offset], &wy[wy_offset], &theta, &col, &head, &iword, &wa[1]
        , &wn[wn_offset], iprint, &info);
L444:
    if (info != 0) {
/*          singular triangular system detected; */
/*          refresh the lbfgs memory and restart the iteration. */
    if (*iprint >= 1) {
/*
        s_wsfe(&io___69);
        e_wsfe();
*/
    }
    info = 0;
    col = 0;
    head = 1;
    theta = 1.;
    iupdat = 0;
    updatd = FALSE_;
    sbtime = sbtime + cpu2 - cpu1;
    goto L222;
    }
    sbtime = sbtime + cpu2 - cpu1;
L555:
/* ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc */

/*     Line search and optimality tests. */

/* ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc */
/*     Generate the search direction d:=z-x. */
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
    d__[i__] = z__[i__] - x[i__];
/* L40: */
    }
L666:
    lnsrlb_(n, &l[1], &u[1], &nbd[1], &x[1], f, &fold, &gd, &gdold, &g[1], &
        d__[1], &r__[1], &t[1], &z__[1], &stp, &dnorm, &dtd, &xstep, &
        stpmx, &iter, &ifun, &iback, &nfgv, &info, task, &boxed, &cnstnd,
        csave, &isave[22], &dsave[17], (ftnlen)60, (ftnlen)60);
    if (info != 0 || iback >= 20) {
/*          restore the previous iterate. */
    dcopy_(n, &t[1], &c__1, &x[1], &c__1);
    dcopy_(n, &r__[1], &c__1, &g[1], &c__1);
    *f = fold;
    if (col == 0) {
/*             abnormal termination. */
        if (info == 0) {
        info = -9;
/*                restore the actual number of f and g evaluations etc. */
        --nfgv;
        --ifun;
        --iback;
        }
        s_copy(task, "ABNORMAL_TERMINATION_IN_LNSRCH", (ftnlen)60, (
            ftnlen)30);
        ++iter;
        goto L999;
    } else {
/*             refresh the lbfgs memory and restart the iteration. */
        if (*iprint >= 1) {
/*
        s_wsfe(&io___71);
        e_wsfe();
*/
        }
        if (info == 0) {
        --nfgv;
        }
        info = 0;
        col = 0;
        head = 1;
        theta = 1.;
        iupdat = 0;
        updatd = FALSE_;
        s_copy(task, "RESTART_FROM_LNSRCH", (ftnlen)60, (ftnlen)19);
        lnscht = lnscht + cpu2 - cpu1;
        goto L222;
    }
    } else if (s_cmp(task, "FG_LN", (ftnlen)5, (ftnlen)5) == 0) {
/*          return to the driver for calculating f and g; reenter at 666. */
    goto L1000;
    } else {
/*          calculate and print out the quantities related to the new X. */
    lnscht = lnscht + cpu2 - cpu1;
    ++iter;
/*        Compute the infinity norm of the projected (-)gradient. */
    projgr_(n, &l[1], &u[1], &nbd[1], &x[1], &g[1], &sbgnrm);
/*        Print iteration information. */
    prn2lb_(n, &x[1], f, &g[1], iprint, &itfile, &iter, &nfgv, &nact, &
        sbgnrm, &nint, word, &iword, &iback, &stp, &xstep, (ftnlen)3);
    goto L1000;
    }
L777:
/*     Test for termination. */
    if (sbgnrm <= *pgtol) {
/*                                terminate the algorithm. */
    s_copy(task, "CONVERGENCE: NORM OF PROJECTED GRADIENT <= PGTOL", (
        ftnlen)60, (ftnlen)48);
    goto L999;
    }
/* Computing MAX */
    d__1 = abs(fold), d__2 = abs(*f), d__1 = max(d__1,d__2);
    ddum = max(d__1,1.);
    if (fold - *f <= tol * ddum) {
/*                                        terminate the algorithm. */
    s_copy(task, "CONVERGENCE: REL_REDUCTION_OF_F <= FACTR*EPSMCH", (
        ftnlen)60, (ftnlen)47);
    if (iback >= 10) {
        info = -5;
    }
/*           i.e., to issue a warning if iback>10 in the line search. */
    goto L999;
    }
/*     Compute d=newx-oldx, r=newg-oldg, rr=y'y and dr=y's. */
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
    r__[i__] = g[i__] - r__[i__];
/* L42: */
    }
    rr = ddot_(n, &r__[1], &c__1, &r__[1], &c__1);
    if (stp == 1.) {
    dr = gd - gdold;
    ddum = -gdold;
    } else {
    dr = (gd - gdold) * stp;
    dscal_(n, &stp, &d__[1], &c__1);
    ddum = -gdold * stp;
    }
    if (dr <= epsmch * ddum) {
/*                            skip the L-BFGS update. */
    ++nskip;
    updatd = FALSE_;
    if (*iprint >= 1) {
/*
        s_wsfe(&io___75);
        do_fio(&c__1, (char *)&dr, (ftnlen)sizeof(doublereal));
        do_fio(&c__1, (char *)&ddum, (ftnlen)sizeof(doublereal));
        e_wsfe();
*/
    }
    goto L888;
    }
/* ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc */

/*     Update the L-BFGS matrix. */

/* ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc */
    updatd = TRUE_;
    ++iupdat;
/*     Update matrices WS and WY and form the middle matrix in B. */
    matupd_(n, m, &ws[ws_offset], &wy[wy_offset], &sy[sy_offset], &ss[
        ss_offset], &d__[1], &r__[1], &itail, &iupdat, &col, &head, &
        theta, &rr, &dr, &stp, &dtd);
/*     Form the upper half of the pds T = theta*SS + L*D^(-1)*L'; */
/*        Store T in the upper triangular of the array wt; */
/*        Cholesky factorize T to J*J' with */
/*           J' stored in the upper triangular of wt. */
    formt_(m, &wt[wt_offset], &sy[sy_offset], &ss[ss_offset], &col, &theta, &
        info);
    if (info != 0) {
/*          nonpositive definiteness in Cholesky factorization; */
/*          refresh the lbfgs memory and restart the iteration. */
    if (*iprint >= 1) {
/*
        s_wsfe(&io___76);
        e_wsfe();
*/
    }
    info = 0;
    col = 0;
    head = 1;
    theta = 1.;
    iupdat = 0;
    updatd = FALSE_;
    goto L222;
    }
/*     Now the inverse of the middle matrix in B is */
/*       [  D^(1/2)      O ] [ -D^(1/2)  D^(-1/2)*L' ] */
/*       [ -L*D^(-1/2)   J ] [  0        J'          ] */
L888:
/* -------------------- the end of the loop ----------------------------- */
    goto L222;
L999:
    time = time2 - time1;
    prn3lb_(n, &x[1], f, task, iprint, &info, &itfile, &iter, &nfgv, &nintol,
        &nskip, &nact, &sbgnrm, &time, &nint, word, &iback, &stp, &xstep,
        &k, &cachyt, &sbtime, &lnscht, (ftnlen)60, (ftnlen)3);
L1000:
/*     Save local variables. */
    lsave[1] = prjctd;
    lsave[2] = cnstnd;
    lsave[3] = boxed;
    lsave[4] = updatd;
    isave[1] = nintol;
    isave[3] = itfile;
    isave[4] = iback;
    isave[5] = nskip;
    isave[6] = head;
    isave[7] = col;
    isave[8] = itail;
    isave[9] = iter;
    isave[10] = iupdat;
    isave[12] = nint;
    isave[13] = nfgv;
    isave[14] = info;
    isave[15] = ifun;
    isave[16] = iword;
    isave[17] = nfree;
    isave[18] = nact;
    isave[19] = ileave;
    isave[20] = nenter;
    dsave[1] = theta;
    dsave[2] = fold;
    dsave[3] = tol;
    dsave[4] = dnorm;
    dsave[5] = epsmch;
    dsave[6] = cpu1;
    dsave[7] = cachyt;
    dsave[8] = sbtime;
    dsave[9] = lnscht;
    dsave[10] = time1;
    dsave[11] = gd;
    dsave[12] = stpmx;
    dsave[13] = sbgnrm;
    dsave[14] = stp;
    dsave[15] = gdold;
    dsave[16] = dtd;
    return 0;
} /* mainlb_ */

/* ======================= The end of mainlb ============================= */

/* ================    L-BFGS-B (version 2.1)   ========================== */
/* Subroutine */
int setulb_(integer *n, integer *m, const doublereal *x, doublereal *l,
      doublereal *u, integer *nbd, doublereal *f, doublereal *g,
      doublereal *factr, doublereal *pgtol, doublereal *wa, integer *iwa,
      char *task, integer *iprint, char *csave, logical *lsave,
      integer *isave, doublereal *dsave, ftnlen task_len, ftnlen csave_len)
{
    /* System generated locals */
    integer i__1;

    /* Local variables */
    static integer lsnd, lsgo, lygo, /* l1,  l2, l3, */ ld, lr, lt;
    static integer lz, lwa, lsg, lyg, lwn, lss, lws, lwt, lsy, lwy, lyy;
    (void)task_len;
    (void)csave_len;

/*     ************ */

/*     Subroutine setulb */

/*     This subroutine partitions the working arrays wa and iwa, and */
/*       then uses the limited memory BFGS method to solve the bound */
/*       constrained optimization problem by calling mainlb. */
/*       (The direct method will be used in the subspace minimization.) */

/*     n is an integer variable. */
/*       On entry n is the dimension of the problem. */
/*       On exit n is unchanged. */

/*     m is an integer variable. */
/*       On entry m is the maximum number of variable metric corrections */
/*         used to define the limited memory matrix. */
/*       On exit m is unchanged. */

/*     x is a double precision array of dimension n. */
/*       On entry x is an approximation to the solution. */
/*       On exit x is the current approximation. */

/*     l is a double precision array of dimension n. */
/*       On entry l is the lower bound on x. */
/*       On exit l is unchanged. */

/*     u is a double precision array of dimension n. */
/*       On entry u is the upper bound on x. */
/*       On exit u is unchanged. */

/*     nbd is an integer array of dimension n. */
/*       On entry nbd represents the type of bounds imposed on the */
/*         variables, and must be specified as follows: */
/*         nbd(i)=0 if x(i) is unbounded, */
/*                1 if x(i) has only a lower bound, */
/*                2 if x(i) has both lower and upper bounds, and */
/*                3 if x(i) has only an upper bound. */
/*       On exit nbd is unchanged. */

/*     f is a double precision variable. */
/*       On first entry f is unspecified. */
/*       On final exit f is the value of the function at x. */

/*     g is a double precision array of dimension n. */
/*       On first entry g is unspecified. */
/*       On final exit g is the value of the gradient at x. */

/*     factr is a double precision variable. */
/*       On entry factr >= 0 is specified by the user.  The iteration */
/*         will stop when */

/*         (f^k - f^{k+1})/max{|f^k|,|f^{k+1}|,1} <= factr*epsmch */

/*         where epsmch is the machine precision, which is automatically */
/*         generated by the code. Typical values for factr: 1.d+12 for */
/*         low accuracy; 1.d+7 for moderate accuracy; 1.d+1 for extremely */
/*         high accuracy. */
/*       On exit factr is unchanged. */

/*     pgtol is a double precision variable. */
/*       On entry pgtol >= 0 is specified by the user.  The iteration */
/*         will stop when */

/*                 max{|proj g_i | i = 1, ..., n} <= pgtol */

/*         where pg_i is the ith component of the projected gradient. */
/*       On exit pgtol is unchanged. */

/*     wa is a double precision working array of length */
/*       (2mmax + 4)nmax + 12mmax^2 + 12mmax. */

/*     iwa is an integer working array of length 3nmax. */

/*     task is a working string of characters of length 60 indicating */
/*       the current job when entering and quitting this subroutine. */

/*     iprint is an integer variable that must be set by the user. */
/*       It controls the frequency and type of output generated: */
/*        iprint<0    no output is generated; */
/*        iprint=0    print only one line at the last iteration; */
/*        0<iprint<99 print also f and |proj g| every iprint iterations; */
/*        iprint=99   print details of every iteration except n-vectors; */
/*        iprint=100  print also the changes of active set and final x; */
/*        iprint>100  print details of every iteration including x and g; */
/*       When iprint > 0, the file iterate.dat will be created to */
/*                        summarize the iteration. */

/*     csave is a working string of characters of length 60. */

/*     lsave is a logical working array of dimension 4. */
/*       On exit with 'task' = NEW_X, the following information is */
/*                                                             available: */
/*         If lsave(1) = .true.  then  the initial X has been replaced by */
/*                                     its projection in the feasible set; */
/*         If lsave(2) = .true.  then  the problem is constrained; */
/*         If lsave(3) = .true.  then  each variable has upper and lower */
/*                                     bounds; */

/*     isave is an integer working array of dimension 44. */
/*       On exit with 'task' = NEW_X, the following information is */
/*                                                             available: */
/*         isave(22) = the total number of intervals explored in the */
/*                         search of Cauchy points; */
/*         isave(26) = the total number of skipped BFGS updates before */
/*                         the current iteration; */
/*         isave(30) = the number of current iteration; */
/*         isave(31) = the total number of BFGS updates prior the current */
/*                         iteration; */
/*         isave(33) = the number of intervals explored in the search of */
/*                         Cauchy point in the current iteration; */
/*         isave(34) = the total number of function and gradient */
/*                         evaluations; */
/*         isave(36) = the number of function value or gradient */
/*                                  evaluations in the current iteration; */
/*         if isave(37) = 0  then the subspace argmin is within the box; */
/*         if isave(37) = 1  then the subspace argmin is beyond the box; */
/*         isave(38) = the number of free variables in the current */
/*                         iteration; */
/*         isave(39) = the number of active constraints in the current */
/*                         iteration; */
/*         n + 1 - isave(40) = the number of variables leaving the set of */
/*                           active constraints in the current iteration; */
/*         isave(41) = the number of variables entering the set of active */
/*                         constraints in the current iteration. */

/*     dsave is a double precision working array of dimension 29. */
/*       On exit with 'task' = NEW_X, the following information is */
/*                                                             available: */
/*         dsave(1) = current 'theta' in the BFGS matrix; */
/*         dsave(2) = f(x) in the previous iteration; */
/*         dsave(3) = factr*epsmch; */
/*         dsave(4) = 2-norm of the line search direction vector; */
/*         dsave(5) = the machine precision epsmch generated by the code; */
/*         dsave(7) = the accumulated time spent on searching for */
/*                                                         Cauchy points; */
/*         dsave(8) = the accumulated time spent on */
/*                                                 subspace minimization; */
/*         dsave(9) = the accumulated time spent on line search; */
/*         dsave(11) = the slope of the line search function at */
/*                                  the current point of line search; */
/*         dsave(12) = the maximum relative step length imposed in */
/*                                                           line search; */
/*         dsave(13) = the infinity norm of the projected gradient; */
/*         dsave(14) = the relative step length in the line search; */
/*         dsave(15) = the slope of the line search function at */
/*                                 the starting point of the line search; */
/*         dsave(16) = the square of the 2-norm of the line search */
/*                                                      direction vector. */

/*     Subprograms called: */

/*       L-BFGS-B Library ... mainlb. */


/*     References: */

/*       [1] R. H. Byrd, P. Lu, J. Nocedal and C. Zhu, ``A limited */
/*       memory algorithm for bound constrained optimization'', */
/*       SIAM J. Scientific Computing 16 (1995), no. 5, pp. 1190--1208. */

/*       [2] C. Zhu, R.H. Byrd, P. Lu, J. Nocedal, ``L-BFGS-B: a */
/*       limited memory FORTRAN code for solving bound constrained */
/*       optimization problems'', Tech. Report, NAM-11, EECS Department, */
/*       Northwestern University, 1994. */

/*       (Postscript files of these papers are available via anonymous */
/*        ftp to eecs.nwu.edu in the directory pub/lbfgs/lbfgs_bcm.) */

/*                           *  *  * */

/*     NEOS, November 1994. (Latest revision June 1996.) */
/*     Optimization Technology Center. */
/*     Argonne National Laboratory and Northwestern University. */
/*     Written by */
/*                        Ciyou Zhu */
/*     in collaboration with R.H. Byrd, P. Lu-Chen and J. Nocedal. */


/*     ************ */
    /* Parameter adjustments */
    --iwa;
    --g;
    --nbd;
    --u;
    --l;
    --x;
    --wa;
    --lsave;
    --isave;
    --dsave;

    /* Function Body */
    if (s_cmp(task, "START", (ftnlen)60, (ftnlen)5) == 0) {
    isave[1] = *m * *n;
/* Computing 2nd power */
    i__1 = *m;
    isave[2] = i__1 * i__1;
/* Computing 2nd power */
    i__1 = *m;
    isave[3] = i__1 * i__1 << 2;
    isave[4] = 1;
    isave[5] = isave[4] + isave[1];
    isave[6] = isave[5] + isave[1];
    isave[7] = isave[6] + isave[2];
    isave[8] = isave[7] + isave[2];
    isave[9] = isave[8] + isave[2];
    isave[10] = isave[9] + isave[2];
    isave[11] = isave[10] + isave[3];
    isave[12] = isave[11] + isave[3];
    isave[13] = isave[12] + *n;
    isave[14] = isave[13] + *n;
    isave[15] = isave[14] + *n;
    isave[16] = isave[15] + *n;
    isave[17] = isave[16] + (*m << 3);
    isave[18] = isave[17] + *m;
    isave[19] = isave[18] + *m;
    isave[20] = isave[19] + *m;
    }
    /* l1 = isave[1];
    l2 = isave[2];
    l3 = isave[3]; */
    lws = isave[4];
    lwy = isave[5];
    lsy = isave[6];
    lss = isave[7];
    lyy = isave[8];
    lwt = isave[9];
    lwn = isave[10];
    lsnd = isave[11];
    lz = isave[12];
    lr = isave[13];
    ld = isave[14];
    lt = isave[15];
    lwa = isave[16];
    lsg = isave[17];
    lsgo = isave[18];
    lyg = isave[19];
    lygo = isave[20];
    mainlb_(n, m, (doublereal *)&x[1], &l[1], &u[1], &nbd[1], f, &g[1], factr, pgtol, &wa[
        lws], &wa[lwy], &wa[lsy], &wa[lss], &wa[lyy], &wa[lwt], &wa[lwn],
        &wa[lsnd], &wa[lz], &wa[lr], &wa[ld], &wa[lt], &wa[lwa], &wa[lsg],
         &wa[lsgo], &wa[lyg], &wa[lygo], &iwa[1], &iwa[*n + 1], &iwa[(*n
        << 1) + 1], task, iprint, csave, &lsave[1], &isave[22], &dsave[1],
         (ftnlen)60, (ftnlen)60);
    return 0;
} /* setulb_ */

/* ======================= The end of setulb ============================= */
