[SciPy-dev] the current state and future directions of the sparse solvers

[Nils Wagner]

On Wed, 9 Apr 2008 09:45:28 +0200
  "Ondrej Certik" <ondrej at certik.cz> wrote:
> On Tue, Apr 8, 2008 at 11:00 PM, Nils Wagner
> <nwagner at iam.uni-stuttgart.de> wrote:
>> On Tue, 8 Apr 2008 22:46:34 +0200
>>
>>  > OK, that sounds very good. I am going to study how to
>>  >start such a
>>  > scikit and we are going to move our additional 
>>solvers
>>  >we have in
>>  > sfepy to it (pysparse, soon petsc4py) -- are you ok 
>>with
>>  >that Robert?
>>  > :) Plus umfpack.  Plus the eigensolvers, like primme,
>>  >blzpack and
>>  > others.
>>  >
>>  AFAIK Jacobi-Davidson is part of pysparse.
> 
> Yep.
> 
>>  And you probably know slepc
>>
>>  http://www.grycap.upv.es/slepc/
>>
>>  http://t2.unl.edu/documentation/slepc4py
> 
> Of course. Even the authors of slepc personally. It's a 
>good project,
> but unfortunately, slepc is not a free software, so I 
>don't want to
> depend on it.
> I think and I hope Jose (one of the authors) will 
>release it as
> opensource in couple years, but for now it is not.
> 
>>
>>  And polyeig ... How about that ?
> 
> You mean this?
> 
> http://www-eleves-isia.cma.fr/documentation/matlab/techdoc/ref/polyeig.html
> 
> I don't need it for my problems, so... :)
> 
>>
>>  Cheers,
>>
>>            Nils
>>
>>  For nonlinear eigenvalue problems, see
>>
>>  http://www.mims.manchester.ac.uk/research/numerical-analysis/nlevp.html
> 
> Thanks, I didn't know about this one.
> 
> Ondrej
  

BTW, it would be great to have solvers for certain 
(linear) matrix equations i.e. Lyapunov, Sylvester, 
Riccati, Stein ... in SciPy / Scikits.

Unfortunately slicot is not a free software.

Any comments ?

Cheers,

           Nils