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5.1.137 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.

See keepring; qring; ring.