[petsc-users] eigenvalues in a band

[Barry Smith]

  Umut,

    You might find this article to be of use,  http://portal.acm.org/citation.cfm?id=1236464 also here http://www.mcs.anl.gov/uploads/cels/papers/P1263.pdf

   Barry


On Jun 25, 2011, at 9:55 AM, Umut Tabak wrote:

> Dear all,
> 
> I am sorry for a question that is not directly related to PETSc however there is large community with a lot experienced people. So the question fits I guess. 
> 
> I would like to extract the eigenvalues/vectors from a band, say such a range as [a,b]. I found out that there are some packages on the netlib pages however they are really outdated fortran codes, at least the ones I checked and there should be a lot of changes on the codes. I was wondering if there is already a package that does what I would like to reach at the end, the range eigenvalues and vectors. So I would be glad if someone who knows some packages that is capable of this operation, would share his/her experience.
> 
> P.S. There is SLEPc however they are not supporting the band option yet, however use of two shifts might be an option and then I can do some post-processing later on to extract the information that I would like. So on that I am aware of.
> 
> Best regards,
> Umut