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5.1.141 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
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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.
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