[petsc-users] BCs for a EPS solver

[Emmanuel Ayala]

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.
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