[petsc-users] Problem with SLEPC Eigenvalue Problem Solver

[Ricardo Marquez]

Hi, I'm trying to solve a vibration generalized eigenvalue problem like
this:

|  K    C |  =  lambda* | M  0 |
| C^t   0 |                    | 0  0 |

I have try a lot of convinations eigensolvers, KSP and PC, but I can't make
that it works.
I use the ST shift-and-invert to get the firsts 5 eigenvalues.
If I use PC or ST_PC = LU or CHOLESKY, I get the zero pivot message error.
If I use PC and ST_PC = NONE, the 5 eigenvalues that find the solver are
exactly the same and equal to the shift value.
If I use PC = jacobi or bjacobi, the eigenvalues get a very big value.

Does anyone knows how this kind of problem solve?

thanks!
-- 
Ricardo Márquez
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