| #### D.3.1.1 compress Procedure from library `matrix.lib` (see matrix_lib). Usage: compress(A); A matrix/ideal/module/intmat/intvec Return: same type, zero columns/generators from A deleted (if A=intvec, zero elements are deleted) Example:
    LIB "matrix.lib";
    ring r=0,(x,y,z),ds;
    matrix A[3][4]=1,0,3,0,x,0,z,0,x2,0,z2,0;
    print(A);
    ==> 1, 0,3, 0,
    ==> x, 0,z, 0,
    ==> x2,0,z2,0
    print(compress(A));
    ==> 1, 3,
    ==> x, z,
    ==> x2,z2
    module m=module(A); show(m);
    ==> // module, 4 generator(s)
    ==> [1,x,x2]
    ==> [0]
    ==> [3,z,z2]
    ==> [0]
    show(compress(m));
    ==> // module, 2 generator(s)
    ==> [1,x,x2]
    ==> [3,z,z2]
    intmat B[3][4]=1,0,3,0,4,0,5,0,6,0,7,0;
    compress(B);
    ==> 1,3,
    ==> 4,5,
    ==> 6,7
    intvec C=0,0,1,2,0,3;
    compress(C);
    ==> 1,2,3

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