Find next eigenvalue?

[Srihari Sritharan]

Hi,

I'm trying to find the 2nd eigenvalue (p orbital) for a Schrodinger
problem I'm solving, and I got it to succeed once and was very happy
with it.

The first eigenvalue is around -0.8 and the next is around -0.7. I
tried to reproduce the results, even by using a high number of
eigenvalues to seek for, but I was unable to do so: all the
eigenvalues would just be slightly altered versions of the -0.8 value,
but never went down to -0.7.
Is there a way to tell the eigensolver to seek further ahead so I can
reliably reproduce the -0.7 eigenvalue I previously found?

Thanks,
Sri

[Pavel Solin]

Pysparse has a target eigenvalue that 

you enter among the input parameters.

This is described in the docs for the 

eigenvalue examples in Hermes.  

Best,

Pavel

 

Thanks,
Sri

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Pavel Solin
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[Srihari Sritharan]

Hi,
I am actually using that, but perhaps something else is at fault (mesh
problems?). I'll look into it.
Thanks!

On Jul 8, 7:56 pm, Pavel Solin <so...@unr.edu> wrote: