On Wed, Oct 27, 2010 at 14:47, Barry Smith <bsmith at mcs.anl.gov> wrote:
> I've considered it but have not seen a specific need. Do you have examples > where it really matters? The natural one would be Dirichlet boundary conditions for (non-Galerkin) geometric multigrid with either variable coefficients or non-uniform mesh size. I still prefer modifying the element matrices before assembly (which also maintains symmetry), but if you want to use MatZeroRows to impose the boundary condition, you would also need a non-constant diagonal. Jed -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20101027/27bd5698/attachment.html>
