I'm trying to use the DMMG structure to do multi-grid as a preconditioner. My grids have non-uniform spacing. I can compute the non-uniform spacing at each level, and I assume I can get that information to the multigrid solver using DASetCoordinates. I also assume that this is needed to correctly compute the matrices that allow you to go from one level to another. My questions are:
1) Where exactly should DASetCoordinates be called? 2) Is it called at each level? 3) Or is it just called for the finest grid? Thanks, Randy -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20100928/7c24046c/attachment.htm>
