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7.5.20.0. polyVars
Procedure from library dmodloc.lib (see dmodloc_lib).

Usage:
polyVars(f,v); f poly, v intvec

Return:
int, 1 if f contains only variables indexed by v, 0 otherwise

Example:
 
LIB "dmodloc.lib";
ring r = 0,(x,y,z),dp;
poly f = y^2+zy;
intvec v = 1,2;
polyVars(f,v); // does f depend only on x,y?
==> 0
v = 2,3;
polyVars(f,v); // does f depend only on y,z?
==> 1