KASH3 Ref - ExtractBlock

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| ### Function ExtractBlock ( elt-alg^mat X, elt-ord^rat i, elt-ord^rat j, elt-ord^rat p, elt-ord^rat q ) -> elt-alg^mat ### Description Return the p by q submatrix of X whose first entry is the [i, j]-th entry of X. ### Examples x_m:=Matrix(Z,3,3,[1,2,3,4,5,6,7,8,9]);ExtractBlock(x_m,1,1,2,2);
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