Singular Manual: findvars

D.8.3.6 findvars

Procedure from library presolve.lib (see presolve_lib).

Usage:

findvars(id ); id=poly/ideal/vector/module/matrix

Return:

list L with 4 entries:

  L[1]: ideal of variables occurring in id
  L[2]: intvec of variables occurring in id
  L[3]: ideal of variables not occurring in id
  L[4]: intvec of variables not occurring in id

Example:

LIB "presolve.lib";
ring s  = 0,(e,f,x,y,t,u,v,w,a,d),dp;
ideal i = w2+f2-1, x2+t2+a2-1;
findvars(i);
==> [1]:
==>    _[1]=f
==>    _[2]=x
==>    _[3]=t
==>    _[4]=w
==>    _[5]=a
==> [2]:
==>    2,3,5,8,9
==> [3]:
==>    _[1]=e
==>    _[2]=y
==>    _[3]=u
==>    _[4]=v
==>    _[5]=d
==> [4]:
==>    1,4,6,7,10