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5.1.124 subst

Syntax:
subst ( poly_expression, ring_variable, poly_expression )
subst ( vector_expression, ring_variable, poly_expression )
subst ( ideal_expression, ring_variable, poly_expression )
subst ( module_expression, ring_variable, poly_expression )
Type:
poly, vector, ideal or module (corresponding to the first argument)
Purpose:
substitutes a ring variable by a polynomial.
Example:
 
  ring r=0,(x,y,z),dp;
  poly f=x2+y2+z2+x+y+z;
  subst(f,x,3/2);
==> y2+z2+y+z+15/4
  int a=1;
  subst(f,y,a);
==> x2+z2+x+z+2
  subst(f,y,z);
==> x2+2z2+x+2z
  subst(f,y,z+1);
==> x2+2z2+x+4z+2
See ideal; map; module; poly; vector.

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