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Re: Eigensystem: different solution in V5.0 and V4.1 ??

• To: mathgroup at smc.vnet.net
• Subject: [mg48323] Re: Eigensystem: different solution in V5.0 and V4.1 ??
• From: Bill Rowe <readnewsciv at earthlink.net>
• Date: Mon, 24 May 2004 00:45:19 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

On 5/23/04 at 6:15 AM, ivo.bleylevens at facburfdaw.unimaas.nl (Ivo
bleylevens) wrote:


>I forgot to say (maybe the most important part of my message) that
>the eigenvalues Mathematica 5.0 calculates, are the correct
>eigenvalues when the notebook is ran at a AMD Athlon 1200 MHz or
>AMD Duron 800 MHz PC and not on a Pentium4 2,6 GHz stand-alone
>machine and a Pentium4 3,06 HT notebook !!

>So: Mathematica 5.0 produces only the right solutions of
>Eigensystem when you don't use a Pentium 4 processor ???

The only way I can see the specific cpu used making a difference is when you are using machine precision numbers and there is a difference between processors with respect to machine precision numbers. This would be most apparent for ill-conditioned systems.
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