I'm trying to use the DMMG structure to do multi-grid as a preconditioner. My grids have non-uniform<br>spacing. I can compute the non-uniform spacing at each level, and I assume I can get that information<br>to the multigrid solver using DASetCoordinates. I also assume that this is needed to correctly compute<br>
the matrices that allow you to go from one level to another. My questions are:<br><br>1) Where exactly should DASetCoordinates be called?<br><br>2) Is it called at each level? <br><br>3) Or is it just called for the finest grid?<br>
<br><br>Thanks, Randy<br><br>