| #### D.11.2.9 colrank Procedure from library `control.lib` (see control_lib). Usage: colrank(M); M a matrix/module Return: int Purpose: compute the column rank of M as of matrix Note: this procedure uses Bareiss algorithm Example:
    LIB "control.lib";
    // de Rham complex
    ring r=0,(D(1..3)),dp;
    module R;
    R=[0,-D(3),D(2)],
    [D(3),0,-D(1)],
    [-D(2),D(1),0];
    R=transpose(R);
    colrank(R);
    ==> 2

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