5.1.133 setring

Syntax:

setring ring_name

Type:

none

Purpose:

changes the basering to another (already defined) ring.

Example:

ring r1=0,(x,y),lp; // the basering is r1 ring r2=32003,(a(1..8)),ds; // the basering is r2 setring r1; // the basering is again r1 nameof(basering); ==> r1 listvar(); ==> // r2 [0] ring ==> // r1 [0] *ring

Use in procedures:

All changes of the basering by a definition of a new ring or a setring command in a procedure are local to this procedure. Use keepring to move a ring, which is local to a procedure, up by one nesting level.