Hessenberg-Precondition for eigenvector computation?

From: Gottfried Helms (helms_at_uni-kassel.de)
Date: 02/27/05 

Date: Mon, 28 Feb 2005 00:53:52 +0100

Hi NG -

 in some articles on eigenvector-computation
 I read, that the transformation of a matrix into
 the Hessenberg-form is seen as a special
 useful preconditioner, for instance, for the Schur-
 decomposition . With some small experiments I came
 to results, which possibly point in other directions.
 Can someone explain, what the reasons are to use the
 Hessenberg-transformation (the reasons were not explained
 in the articles)?

Gottfried Helms

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