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D.2.6.1 changechar

Procedure from library ring.lib (see ring_lib).

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

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

Note:
Works for qrings if map from old_char to new_char is implemented. This proc uses 'execute' or calls a procedure using 'execute'.

Example:
 
LIB "ring.lib";
ring r=0,(x,y,u,v),(dp(2),ds);
def R=changechar("2,A"); R;"";
==> //   characteristic : 2
==> //   1 parameter    : A 
==> //   minpoly        : 0
==> //   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;
==> //   characteristic : 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;


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