Singular Manual: setring

  | ### 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
`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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