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D.2.11.1 changechar

Procedure from library ring.lib (see ring_lib).

Usage:
changechar(c[,r]); c=list, r=ring

Return:
ring R, obtained from the ring r [default: r=basering], by changing ringlist(r)[1] to c.

Example:
 
LIB "ring.lib";
ring rr=2,A,dp;
ring r=0,(x,y,u,v),(dp(2),ds);
def R=changechar(ringlist(rr)); R;"";
==> // coefficients: ZZ/2(A)
==> // number of vars : 4
==> //        block   1 : ordering dp
==> //                  : names    x y
==> //        block   2 : ordering ds
==> //                  : names    u v
==> //        block   3 : ordering C
==> 
def R1=changechar(32003,R); setring R1; R1;
==> // coefficients: ZZ/32003
==> // number of vars : 4
==> //        block   1 : ordering dp
==> //                  : names    x y
==> //        block   2 : ordering ds
==> //                  : names    u v
==> //        block   3 : ordering C
kill R,R1;