Opened 9 years ago

Closed 7 years ago

#629 closed bug (fixed)

bug in std over integers

Reported by: kroeker@… Owned by: popescu
Priority: critical Milestone: 4-1-0 and higher
Component: dontKnow Version: 4-0-0
Keywords: std integer bug Cc:

Description

std over integers terminates prematurely, see example: 

ring rng = integer,(x,y,z),lp;
ideal  IJ= 13xyz+6xy+78xz+36x-11y2z-66yz,
168xyz+84xy+1008xz+504x+12y3-154y2z+72y2-924yz,
-168x2yz2-84x2yz-1008x2z2-504x2z+xy3z+6xy3+154xy2z2+6xy2z+36xy2+924xyz2-11y4z-66y3z;

 ideal stdIJ = std(IJ);
 stdIJ;
ideal stdstdIJ = std(stdIJ);
 stdstdIJ;

output: 

>  stdIJ;
stdIJ[1]=312y3z+144y3-308y2z2+1872y2z+864y2-1848yz2
stdIJ[2]=156y5z+72y5+1562y4z2+1728y4z+432y4-1694y3z3+9372y3z2+4752y3z-10164y2z3
stdIJ[3]=84xy+504x+156y3-154y2z+936y2-924yz
stdIJ[4]=xyz+78xy+6xz+468x-312y3z+308y2z2-2015y2z+1848yz2-858yz
> ideal stdstdIJ = std(stdIJ);
>  stdstdIJ;
stdstdIJ[1]=156y3z+72y3-154y2z2+936y2z+432y2-924yz2
stdstdIJ[2]=84xy+504x+156y3-154y2z+936y2-924yz
stdstdIJ[3]=xyz+78xy+6xz+468x-312y3z+308y2z2-2015y2z+1848yz2-858yz
>

Change History (2)

comment:1 Changed 9 years ago by boehm

Owner: changed from somebody to popescu

comment:2 Changed 7 years ago by hannes

Resolution: → fixed
Status: new → closed

fixed with 67e0dc31cecb425433f640594911fc9df2b15076

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