Hi everyone, I have an eigenvalue problem where I need to apply BCs to the stiffness and mass matrix.
Usually, for KSP solver, it is enough to set to zero the rows and columns related to the boundary conditions. I used to apply it with MatZeroRowsColumns, with a 1s on the diagonal. Then the solver works well. There is something similar to KSP for EPS solver ? I already used MatZeroRowsColumns (for EPS solver), with a 1s on the diagonal, and I got wrong result. Kind regards.
