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D.15.19.1 swalk
Procedure from library swalk.lib (see swalk_lib).
- Usage:
- swalk(i[,v,w]); i ideal, v,w int vectors
- Return:
- The sagbi basis of the subalgebra defined by the generators of i,
calculated via the Sagbi walk algorithm from the ordering dp to lp
if v,w are not given (resp. from the ordering (a(v),lp) to the
ordering (a(w),lp) if v and w are given).
Example:
| | LIB "swalk.lib";
ring r = 0,(x,y), lp;
ideal I =x2,y2,xy+y,2xy2+y3;
swalk(I);
==> _[1]=x2
==> _[2]=y2
==> _[3]=xy+y
==> _[4]=xy2
==> _[5]=y3
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