Opened 15 years ago

Closed 14 years ago

#161 closed bug (fixed)

imap from reals to rationals seems to loose signs of coefficients

Reported by: Madalina (User Forum) Owned by: hannes
Priority: minor Milestone: 3-1-1
Component: singular-kernel Version: 3-1-0
Keywords: imap Cc:

Description

reported by Madalina (User Forum, 28 Aug 2009)

here's a code sample to illustrate the effect:

ring r=real, (x,y), dp;

poly f= -1+2x2+3y3-2x-3y; poly g= -1-2x2-3y3+x+3y; ideal m=f,g; ring t=0,(x,y),dp; ideal n=imap(r,m); n[1];

3y3+2x2+2x+3y+1

n[2];

3y3+2x2+x+3y+1

poly newf=imap(r,f); poly newg=imap(r,g); newf;

3y3+2x2+2x+3y+1

newg;

3y3+2x2+x+3y+1

Change History (3)

comment:1 Changed 14 years ago by seelisch

Owner: changed from somebody to hannes

comment:2 Changed 14 years ago by hannes

Status: newassigned

fixed sign bug in kernel/longrat.cc: nlMapR

comment:3 Changed 14 years ago by hannes

Resolution: fixed
Status: assignedclosed

fixed sign bug in kernel/longrat.cc: nlMapR

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