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

• To: mathgroup at smc.vnet.net
• Subject: [mg48322] Re: Eigensystem: different solution in V5.0 and V4.1 ??
• From: ivo.bleylevens at facburfdaw.unimaas.nl (Ivo bleylevens)
• Date: Mon, 24 May 2004 00:45:18 -0400 (EDT)
• References: <c8mu5a$8nu$1@smc.vnet.net> <c8pu0g$kps$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi Fred !

You said: "Plug your results back into the fundamental relationship."
I checked this in two ways:
* The relation A*v = labda*v, where A is my 512x512 matrix, v an
eigenvector and labda an eigenvalue of A doens't solve at all for the
512 computed values/vectors.
* The eigenvalues of the matrix A are the solutions of a system of
equations (because of using the Stetter-Moeller techniques). Plugging
the eigenvalues into this system doens't solve the system.

The eigenvalues calculated with Mathematica 4.1 at all machines (AMD &
Intel) and Mathematica 5.0 at the AMD machines solve both the equation
and the system of equations rather perfectly !!

Thanks for your reply anyway !!

Ivo