| #### D.15.29.7 vecFieldToMatrix Procedure from library `VecField.lib` (see VecField_lib). Usage: vecFieldToMatrix(VecField V,ideal W) Return: the matrix representation of V restricted to span(W), in the basis specified by W. Example:
    LIB "VecField.lib";
    int oldp = printlevel;
    printlevel = 1;
    ring r = 0, (x, y, z),ds;
    vector v = [-1,-1,-1];
    VecField V = v;
    V.precision = 4;
    map phi = r, x-2y2+z3,2y+y3+z,z;
    VecField W = changeCoordinates(V,phi);
    matrix m = vecFieldToMatrix(W,maxideal(2));
    printlevel = oldp;

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