D.14.1.7 varNum

Usage:

varnum(string s);
varnum(ring_variable);

Return:

[int] number of given ring variable, or 0 if it does not appear

Note:

This procedure has the same functionality as varNum from the dmod.lib package, but also accepts polys as input.

LIB "arr.lib";
ring R = 0,(x,y,z),dp;
varNum(y);
==> 2
ring S = 0,(x(1..5),y(1..5)),dp;
varNum("y(3)");
==> 8