Re: Eigensystem: different solution in V5.0 and V4.1 [SOLVED: BUG in 5.0]
- To: mathgroup at smc.vnet.net
- 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: <c8mu5a$8nu$1@smc.vnet.net>
- 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 ?? Hello Ivo, 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. Regards, Marcus technical data: OS: Fedora Core release 1 Kernel: 2.4.22-1.2149.nptl CPU: Intel(R) Pentium(R) 4 CPU 2.66GHz -- Am I my brother's keeper? Yes. Interestingly, in my case I share that honor with the Prospect Park Zoo. -- W. Allen