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Re: eignenvalue for nonsymmetric matrix

From: David Bateman
Subject: Re: eignenvalue for nonsymmetric matrix
Date: Thu, 07 Apr 2005 18:16:02 +0200
User-agent: Mozilla Thunderbird 0.8 (X11/20040923)

Marino Kekana wrote:

I have installed gnu octave version 2.1.67 together with octave-
forge-2004.09.09 on fedora core 3. I want to solve the eigenproblem of
a non-symmetric full matrix. Octave gives me the following error:
error: dgeev failed to converge. The sample problem is below.

octave:1> stiff = [1,2,3,4;5,6,7,8;9,10,11,12;13,14,15,16]
stiff =

  1   2   3   4
  5   6   7   8
  9  10  11  12
 13  14  15  16

octave:2> eig(stiff)
error: dgeev failed to converge

Regards, Marino.

I think you might have fallen into the known Fedora Core bug in their distributed LAPACK/ATLAS libraries. Search the list for more details about the gcc "-float-store" option and where you can find rpm replacements for these files...


David Bateman                                address@hidden
Motorola Labs - Paris +33 1 69 35 48 04 (Ph) Parc Les Algorithmes, Commune de St Aubin +33 1 69 35 77 01 (Fax) 91193 Gif-Sur-Yvette FRANCE

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