| #### 7.10.6.23 ncrepEvaluate Procedure from library `ncrat.lib` (see ncrat_lib). Usage: matrix M = ncrepEvaluate(q); Return: for q=(u, Q, v) calculate -u*Q^(-1)*v Example:
    LIB "ncrat.lib";
    ncInit(list("x", "y", "z"));
    ncrat f = ncratFromString("x+y");
    ncrep q = ncrepGet(f);
    matrix A[2][2] = 1, 2, 3, 4;
    matrix B[2][2] = 5, 6, 7, 8;
    ncrep s = ncrepSubstitute(q, list(x, y), list(A, B));
    matrix M = ncrepEvaluate(s);
    print(M);
    ==> 6, 8,
    ==> 10,12

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