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

• To: mathgroup at smc.vnet.net
• Subject: [mg48346] Re: Eigensystem: different solution in V5.0 and V4.1 ??
• From: "Peltio" <peltio at twilight.zone>
• Date: Tue, 25 May 2004 07:17:10 -0400 (EDT)
• References: <c8rv31$8p2$1@smc.vnet.net>
• Reply-to: "Peltio" <peltioNOSP at Mdespammed.com.invalid>
• Sender: owner-wri-mathgroup at wolfram.com

"Bill Rowe" wrote

>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.

I thought that 32 bits Intel and AMD architectures shared the same
internal representation for binary floating point numbers. I knew of the
different way basic operations were handled (with AMD having better
performances in the FPU arena), but I did not expect to get different
results for the same computation.
If this is the case, what makes such a difference?

The fact that this discrepancy comes up only with Mathematica 5 could have anything
to do with its optimization for 64 bits architectures?

cheers,
Peltio
totally unaware of _this_ particular platform dependance.
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