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Re: eignenvalue for nonsymmetric matrix
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From: |
Madhusudan Singh |
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Subject: |
Re: eignenvalue for nonsymmetric matrix |
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Date: |
Thu, 7 Apr 2005 12:21:19 -0400 |
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User-agent: |
KMail/1.7.1 |
On Thursday 07 April 2005 04:14, 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
> octave:2>
>
> Regards, Marino.
Converges to something for me (Debian Sarge) :
GNU Octave, version 2.1.64 (i386-pc-linux-gnu).
octave:1> s = [1,2,3,4;5,6,7,8;9,10,11,12;13,14,15,16]
s =
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
octave:2> eig(s)
ans =
36.20937 + 0.00000i
-2.20937 + 0.00000i
0.00000 + 0.00000i
0.00000 - 0.00000i
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