From bug-request at octave dot org Sun Dec 19 15:02:14 2004
Subject: Re: rank problem
From: Quentin Spencer <qspencer at ieee dot org>
To: Geraint Paul Bevan <g dot bevan at mech dot gla dot ac dot uk>
CC: Andrea <agaleazzi at aliceposta dot it>, bug-octave@bevo.che.wisc.edu
Date: Sun, 19 Dec 2004 15:01:34 -0600

I am quite confident that this problem is indeed caused by the broken 
LAPACK. Updated libraries (BLAS and LAPACK) should both be installed, 
and they can be found at
http://download.fedora.redhat.com/pub/fedora/linux/core/development/i386/Fedora/RPMS/blas-3.0-27.i386.rpm
http://download.fedora.redhat.com/pub/fedora/linux/core/development/i386/Fedora/RPMS/lapack-3.0-27.i386.rpm

Also if you are interested in an updated version of octave, I have 
created a web page with packages for octave and octave forge at
http://webpages.charter.net/qspencer/octave/octave.html
Some of them are RPMs that I built, and some are links to external sources.

-Quentin



Geraint Paul Bevan wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Andrea wrote:
>
> | Description:
> | -----------
> |
> |   * I've got a problem to calculate the rank and the pseudoinverse of a
> | matrix. In particular when I try, i.e., to calculate the rank of a
> | square random matrix sometimes the system seems to be in loop and other
> | times answers me with a zero
> |
>
>
> | Configuration (please do not edit this section):
> | -----------------------------------------------
> |
> | uname output:     Linux localhost.localdomain 2.6.9-1.681_FC3 #1 Thu 
> Nov
> | C compiler:       gcc, version 3.4.2 20041006 (Red Hat 3.4.2-5)
>
> The rank of a matrix is calculated using singular value decomposition
> which is performed using the LAPACK library.
>
> There have been some reports on the lists that Fedora Core 3 (which you
> appear to be using) ships with a broken LAPACK library, e.g:
> http://www.octave.org/octave-lists/archive/octave-maintainers.2004/msg00817.html 
>
>
> Perhaps your problem is related to this?
>
> - --
> Geraint Bevan
> http://homepage.ntlworld.com/geraint.bevan




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