From: Brian Gough <bjg@network-theory.co.uk>
To: Devin Balkcom <devin@ri.cmu.edu>
Cc: gsl-discuss@sources.redhat.com
Subject: Re: SVD bugs in gsl version .9.1?
Date: Wed, 19 Dec 2001 13:20:00 -0000 [thread overview]
Message-ID: <15244.5395.985031.513235@debian> (raw)
In-Reply-To: <3B8BE5C9.FA9DE2F@ri.cmu.edu>
Devin Balkcom writes:
> I'm using gsl to take singular value decompositions. I have had
> problems with all three of the
> implementations. I have written a test program.
>
> - gsl_linalg_SV_decomp() does not return for the test matrix.
> - gsl_linalg_SV_decomp_mod() also does not return.
> - gsl_linalg_SV_decomp_jacobi() does return, although I have had it fail
> in other circumstances,
> with an incorrect result. (I will send test code for this case
> later.)
Thanks for the bug report.
It is a bug in the SVD.... which is not handling the 2x2 case [0,X;0,0]
correctly, so it never converges for that matrix. I'll fix that.
regards
Brian Gough
next prev parent reply other threads:[~2001-12-19 13:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-19 13:20 Devin Balkcom
2001-12-19 13:20 ` Brian Gough [this message]
2001-12-19 13:20 ` Brian Gough
[not found] ` <000b01c13115$f384b780$ad96f88f@sghong>
2001-12-19 13:20 ` GSL for MSVC++ (Warning message report) Brian Gough
2001-12-19 13:20 ` Brian Gough
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