The usual trick is to set ones in one matrix and zeros in the other one.
On Mon, 2020-02-17 at 12:35 -0600, Emmanuel Ayala wrote: > 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. > > > >
