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
