Re: Eigensystem: different solution in V5.0 and V4.1 [SOLVED: BUG in 5.0]
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- Subject: [mg48407] Re: Eigensystem: different solution in V5.0 and V4.1 [SOLVED: BUG in 5.0]
- From: Marcus Stollsteimer <marcus314 at yahoo.com>
- Date: Fri, 28 May 2004 00:50:38 -0400 (EDT)
- References: <firstname.lastname@example.org>
- Sender: owner-wri-mathgroup at wolfram.com
Ivo bleylevens wrote:
> I have an 512x512 non-symmetric complex matrix M.
> When i use the command eigsys = Eigensystem[M] in Mathematica 5.0,
> the eigenvalues were not the eigenvalues I expected ! I calculated
> exactly the same notebook in Mathematica version 4.1 and these
> eigenvalues look the same as the wanted eigenvalues !! Am i doing
> something wrong in version 5.0 ??
I evaluated your notebook both in Mathematica versions 5.0 and 5.0.1,
and here are the results:
5.0 wrong eigenvalues
5.0.1 correct result
It clearly *is* a bug in the 5.0 version.
As I already mentioned, we had a similar problem
with complex hermitian matrices bigger than 256x256.
The bug seems only to affect complex matrices,
there was no problem with eigenvalues of real matrices.
OS: Fedora Core release 1
CPU: Intel(R) Pentium(R) 4 CPU 2.66GHz
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that honor with the Prospect Park Zoo. -- W. Allen
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