Dear all, I am dealing with large, sparse symmetric (and hermitian) matrices (N ~ 1e5) and I am using slepc in order to solve them. For now, I was using the matrix type MATMPISBAIJ to fill my matrix in parallel and I was solving the EVP for the EPS_SMALLEST_REAL eigenvalues just fine.
Now I am dealing with spectra, where I am not desired in knowing the small real part of the eigenvalue spectrum, but rather in some energy interval - thus, making me want to use spectrum slicing. For that I have browsed your documentation and now I am a little concerned on what to do. I saw that my matrix type is not supported for LU decomposition, so I have converted my matrix to type MATMPIAIJ. There is this table here (https://urldefense.us/v3/__https://petsc.org/release/overview/linear_solve_table/__;!!G_uCfscf7eWS!e_EQDlcM6bSB8ayYFeVL6q8O-g91z5wOtB-pL91VevkcE-S7h_vfKV-Tx7PRpJRVsRJuYkvple6k1IZvvAPGGWPJsYRnSAPKf3SZ$ ), where I found which solvers are available for which matrix type. What I can not fully understand are the columns Parallel and Complex. What does it mean to have an X in there, does it mean it is possible or not? Do I need to compile Petsc with external LU-solver packages or not? Thanks in advance for your reply! Best, Franz --------------------------------------------------------- MSc. Franz Fischer Universität Hamburg HARBOR, Geb. 610 Luruper Chaussee 149 D-22761 Hamburg ---------------------------------------------------------
