[petsc-users] SLEPC matrix Query

[Savneet Kaur]

Hello Again,

Yes I would like to find for the initial 10% and 20% of the eigenpairs. 
But in addition to this,I also want to check for the full spectrum.

So, how shall I proceed with it?

Thank You.

Regards,
savneet

Le 25/04/2018 à 11:33, Matthew Knepley a écrit :
> On Wed, Apr 25, 2018 at 5:10 AM, Savneet Kaur <Savneet.KAUR at cea.fr 
> <mailto:Savneet.KAUR at cea.fr>> wrote:
>
>     Hello,
>
>     Warm Regards
>
>     I am Savneet Kaur, a master student at University Paris Saclay and
>     currently pursuing an internship at CEA Saclay (France).
>
>     I have recently started to understand the slepc and petsc solvers,
>     by taking up the tutorials for eigenvalue problems. In my
>     internship work I have to develop a laplacian matrix from a given
>     transition rate matrix and solve it using SLEPC and PETSC and to
>     evaluate the lowest eigenvalue.
>
>     I was wondering if I could get some information. I need to
>     diagonalize a 2D Laplacian matrix. And writing a code in C and
>     diagonalizing it is easy. But I am not getting it how to
>     accommodate with the SLEPC Program. Am i suppose to use any
>     packages or it will is done by a loop? Or I need to read some
>     other manual to understand how does it work. Please kindly let me
>     know.
>
> I would just like to clarify some terminology. "Diagonalize" would 
> usually mean find all eigenvalues and eigenvectors.
> Is this what you mean? Often, SLEPc users want only a portion of the 
> spectrum since the matrices are enormous.
>
>   Thanks,
>
>      Matt
>
>     The diagonalizing a matrix will be preliminary step of my work.
>
>     I will be highly obliged to the the team, if I could get help.
>
>     Hoping for a favorable response from your side.
>
>     Thank you for the time and consideration.
>
>
>     Sincerely,
>
>     *Savneet Kaur*
>
>     *Intern at DEN/DANS/DMN/SRMP*
>
>     *CEA - Centre de Saclay ǀ Bâtiment 520
>     *
>
>     *91191 Gif-sur-Yvette Cedex*
>
>     *France*
>
>     *Tel: +33 (0) 666 749 000*
>
>     *Email: savneet.kaur at cea.fr <mailto:savneet.kaur at cea.fr>
>     *
>
>
>
>
>
>
> -- 
> What most experimenters take for granted before they begin their 
> experiments is infinitely more interesting than any results to which 
> their experiments lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/%7Emk51/>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20180425/9872ee43/attachment.html>