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 Post subject: Bugs in matrix code?
PostPosted: Thu Aug 11, 2005 5:33 pm 
This seems like a bug to me. Working with matrices, I get the following from Singular:

> m;
1,2,3,
4,5,6,
7,8,9
> minor(m,2);
_[1]=-3
_[2]=-6
_[3]=-6
_[4]=-12
_[5]=3
_[6]=6
_[7]=-3
_[8]=-6
_[9]=3

From hand computation, I get
-3, +6, -3, +6, -12, +6, -3, +6, -3

Are we working from different definitions, or am I just off base?

Regards,

Justin


email: justin@mac.com
Posted in old Singular Forum on: 2005-04-25 02:30:46+02


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 Post subject:
PostPosted: Tue Sep 20, 2005 5:00 pm 
Site Admin

Joined: Fri Apr 29, 2005 12:02 am
Posts: 24
Location: Germany, Kaiserslautern
Dear Justin Walker,

the Singular command minor is mainly intended for computing the ideal spanned by all the minors. Thus Singular does not care about signs.

Sincerely,

Oliver Wienand


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