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MathGroup Archive 2002

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Re: information on Eigensystem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33587] Re: information on Eigensystem
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 2 Apr 2002 03:36:37 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <a890u0$nto$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

the Numerical Recipes use the EISPACK code and one can't do better
than to use EISPACK or the original ALGOL source for 
Wilinson/Reinsch.

Regards
  Jens

Borut L wrote:
> 
> Hello,
> 
> I am doing a comparison between three methods for finding an eigensystem of
> a matrix, Numerical Recipes tqli + tred2, jacobi, and Mathematica's
> Eigensystem[].
> 
> I would like to acquire info on which algorithm does Mathematica have for
> finding it out? What does she do in a case of a real symmetric matrix? I am
> asking it because I haven't found anything in the implementation notes.
> 
> Thank you for you time,
> 
> Borut from Slovenia


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