Hi, I'm trying to use the ARPACK interface in SLEPc for calculating smallest eigenvalues with eigenvectors of a generalized eigenproblem. The matrices are symmetric.
What are the suggested linear solvers/preconditioners for this type of a system when using ARPACK? I am using shift and invert with a shift of 0. I get a lot of spurious eigenvalues when I use GMRES linear solver or MUMPS for LU factorization. Chebyshev doesn't seem to converge (I don't have a good guess for the higher end of eigenvalues). Thanks, Harshad
