On Tue, Sep 28, 2010 at 20:59, Randall Mackie <rlmackie862 at gmail.com> wrote: > 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?
You will have to call it at every level, DARefine and DACoarsen do not currently interpolate coordinates. Maybe they should? Jed
