Re: how does octave compute eigen values

[Jaroslav Hajek]

On Wed, Oct 29, 2008 at 6:27 AM, Kamaraju S Kusumanchi
<address@hidden> wrote:
> Can someone tell me the algorithm used by octave to compute the
> eigenvalues/eigenvectors of a general nonsymmetric real matrix using the
> eig function?
>
> Does it simply use the dgeev routine of lapack or does it do anything else
> special?
>

Octave uses xGEEV / xSYEV / xHEEV for eigenvalues. If you have an
example where Octave's result differs, please post the matrix (along
with a test program calling LAPACK if possible).


> For me, the eigen vectors computed from dgeev routine of lapack are
> different from those given by octave 3.0. I want to find out where the
> difference is coming from.
>
> Does octave do anything special after computing the eigen vectors from the
> dgeev routine?
>
> thanks
> raju
> --
> Kamaraju S Kusumanchi
> http://www.people.cornell.edu/pages/kk288/
> http://malayamaarutham.blogspot.com/
>
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>



-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz