Re: [Help-gsl] Complex eigenvalues

[Andras Simon]

Thanks, it cleared up some of the misunderstanding I had...
Now the problem I run into is that the gsl_eigen_nonsymm()
and similar functions are simply missing from the GSL distro
I have....I use it on Mac OS 10.4.9, via fink, and it is
Version 1.7-3. Did the gsl_eigen_nonsymm() appear in later
versions ?

Andras


On 5/10/07 4:41 AM, "Hannes Basler" <address@hidden> wrote:

> Hi,
> all eigenvalues of a Hermitian Matrix are real, so there is no need
> for complex eigenvalues if you use gsl_eigen_herm(). A symmetric
> matrix is a special case of a hermitian matrix and has also only real
> eigenvalues.
> If you have a nonsymmetric real matrix you can use gsl_eigen_nonsymm
> (), this function gives the eigenvalues in a gsl_vector_complex*.
> At the moment there is no function to compute the eigenvalues of a
> nonhermitian complex matrix in GSL.
> 
> Cheers,
> Hannes
> 
> On May 10, 2007, at 9:21 AM, Andras Simon wrote:
> 
>> Hi there,
>> 
>> 
>> I have been searching the archives, but could not find the answer
>> to this
>> question: how to calculate the complex eigenvalues of a real or
>> complex
>> matrix ? I have tried gsl_eigen_herm() and gsl_eigen_symm(), but it
>> appears
>> as both functions assume that the eigenvalues are real (the type of
>> eigenvalues vector is gsl_vector* type). I could not figure out how
>> to get
>> the complex eigenvalues into a gsl_vector_complex*.
>> Any ideas ? Comments ?
>> 
>> Any help is appreciated, I'm stuck ;(
>> 
>> 
>> Thanks,
>> Andras Simon
>> 
>> address@hidden
>> 
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________
>> Help-gsl mailing list
>> address@hidden
>> http://lists.gnu.org/mailman/listinfo/help-gsl
> 

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