From: Brian Gough <bjg@network-theory.co.uk>
To: Lowell Johnson <ldj00@sio.midco.net>
Cc: gsl-discuss@sources.redhat.com
Subject: Re: Nonsymmetric eigenvalue problem
Date: Wed, 14 Aug 2002 14:48:00 -0000 [thread overview]
Message-ID: <15706.52507.397741.845037@debian> (raw)
In-Reply-To: <Pine.LNX.4.44.0208131915370.5727-100000@host-245-233-220-24.midco.net>
Lowell Johnson writes:
> I notice that GSL doesn't (yet) support the computation of the
> eigenvalues of nonsymmetric matrices. I've started converting my
> Fortran-based Mathieu function code over to C and ran into the
> symmetric eigenvalue limitation in GSL. For my original Fortran
> routines, I used the EISPACK routine RG(), which computes the
> eigenvalues and eigenvectors of a real, general matrix. I was
> hoping to be able to use the GSL eigenvalue routines. I have to
> determine the eigenvalues for four matrices. The one listed above
> is the only nonsymmetric matrix. The GSL routines work great for
> the other three matrices.
> Any comments or suggestions?
The algorithm for non-symmetric eigenvalues is very complicated, which
is why it wasn't implemented. Maybe there is a simpler algorithm for
handling tridiagonal nonsymmetric matrices though.
What method does Fayez Alhargan use in the TOMS papers?
next prev parent reply other threads:[~2002-08-14 21:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-13 17:38 Lowell Johnson
2002-08-14 14:48 ` Brian Gough [this message]
2002-08-15 5:57 ` Lowell Johnson
2002-08-15 16:06 ` Brian Gough
2002-08-16 12:32 ` Brian Gough
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