Top
Back: changechar
Forward: changevar
FastBack: redcgs_lib
FastForward: Linear algebra
Up: ring_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

D.2.8.2 changeord

Procedure from library ring.lib (see ring_lib).

Usage:
changeord(newordstr[,r]); newordstr=string, r=ring/qring

Return:
ring R, obtained from the ring r [default: r=basering], by changing ordstr(r) to newordstr. If, say, newordstr=("R","wp(2,3),dp") and if the ring r exists and has >=3 variables, the ring R will be equipped with the monomial ordering wp(2,3),dp.

Note:
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=changeord("wp(2,3),dp"); R; "";
==> //   characteristic : 0
==> //   number of vars : 4
==> //        block   1 : ordering wp
==> //                  : names    x y
==> //                  : weights  2 3
==> //        block   2 : ordering dp
==> //                  : names    u v
==> //        block   3 : ordering C
==> 
ideal i = x^2,y^2-u^3,v;
qring Q = std(i);
def Q'=changeord("lp",Q); setring Q'; Q';
==> //   characteristic : 0
==> //   number of vars : 4
==> //        block   1 : ordering lp
==> //                  : names    x y u v
==> //        block   2 : ordering C
==> // quotient ring from ideal
==> _[1]=v
==> _[2]=x2
==> _[3]=y2-u3
kill R,Q,Q';


Top Back: changechar Forward: changevar FastBack: redcgs_lib FastForward: Linear algebra Up: ring_lib Top: Singular Manual Contents: Table of Contents Index: Index About: About this document
            User manual for Singular version 3-1-2, Oct 2010, generated by texi2html.