| #### D.15.29.1 applyVecField Procedure from library `VecField.lib` (see VecField_lib). Usage: applyVecField(VecField V, poly/ideal p [,int n]) Return: if p is a polynomial, return a polynomial V(p), if p is an ideal, the ideal V(p). If an optional n is given, only the parts of V up to and including degree n are applied to p. Example:
    LIB "VecField.lib";
    int oldp = printlevel;
    printlevel = 1;
    ring r = 0, (x, y, z),ds;
    vector v = [-1,-1,-1];
    VecField V = v;
    poly f = x3+2y3+xz2;
    poly g = V*f;
    ideal I = (x2,y);
    ideal J = V*I;
    printlevel = oldp;

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