Singular Manual: evaluatePDivisor

| #### D.15.13.18 evaluatePDivisor Procedure from library `divisors.lib` (see divisors_lib). Usage: evaluatePDivisor(D,v); D = pdivisor, v = intvec. Assume: D is a polyhedral divisor on X and v is a point in the dual of the tailcone of the coefficients. Return: a formal divisor on X Theory: Will evaluate the polyhedral sum to an integer formal sum. Example:
    LIB "divisors.lib";
    ==> Welcome to polymake version
    ==> Copyright (c) 1997-2015
    ==> Ewgenij Gawrilow, Michael Joswig (TU Darmstadt)
    ==> http://www.polymake.org
    LIB("polymake.so");
    ring r=31991,(x,y,z),dp;
    ideal I = y^2*z - x*(x-z)*(x+3*z);
    qring Q = std(I);
    divisor A = makeDivisor(ideal(x,z),ideal(1));
    divisor B = makeDivisor(ideal(x,y),ideal(1));
    intmat M[4][4]= 1,4,0,0,
    1,0,3,0,
    0,0,0,2,
    1,1,1,1;
    polytope PP = polytopeViaPoints(M);
    pdivisor pD = makePDivisor(list(list(PP,A),list(PP,B)));
    intvec v=1,1,1;
    evaluatePDivisor(pD,v);
    ==> polymake: used package ppl
    ==>   The Parma Polyhedra Library (PPL): A C++ library for convex polyhedra
    ==>   and other numerical abstractions.
    ==>   http://www.cs.unipr.it/ppl/
    ==>
    ==> 3*( (z,x) - (1) )
    ==> +3*( (y,x) - (1) )
    ==>

User manual for Singular version 4-1-3p2, 2020, generated by texi2html.