MathGroup Archive: April 1995 [00225]

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Re: Eigensystem

To: mathgroup at christensen.cybernetics.net
Subject: [mg914] Re: Eigensystem
From: saarinen (Sirpa Saarinen)
Date: Sun, 30 Apr 1995 03:48:39 -0400

In <3nkbgd$mq8 at news0.cybernetics.net> bouyer at ext.jussieu.fr (Frederic BOUYER) writes:

>Dear all,

>I just would like to know what is the default numerical method used for the
>function Eigensystem[] for diagonalizing the matrix.

For Eigensystem Mathematica uses first an reduction to the Hessenberg form, 
and then a shifted QR iteration.

Sirpa Saarinen
saarinen at wri.com

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