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Octave 3.2.3: wrong matrix calculation
- From: texsit <texsit at yahoo dot it>
- To: cygwin at cygwin dot com
- Date: Mon, 3 May 2010 08:39:54 +0000 (GMT)
- Subject: Octave 3.2.3: wrong matrix calculation
Hi All,
I use octave 3.2.3 under Cygwin (windows 7) for my math application.
I discovered a bad calculation calling the function det(). The step to reproduce is this:
> A = [1,2,3;4,5,6;7,8,9];
> det(A)
ans = -9.5171e-16
The matrix is singular so I expected the resul was 0 and not a very very little number. I problem is the same also with Octave 3.2.4.
At the begin I thougth it was only a round error, but I've made the same proof with Octave under Debian Linux (lenny).
Under Linux?the resul has been 0 as I expected.
Can anyone suggest me something to solve that problem?
I'm using Cygwin 1.7.5-1 with Intel centrino 2 and windows 7 64 bit.
Thank you in advance.
Regards.
Luca
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