On Thu, Oct 8, 2009 at 3:21 PM, Matt Funk <mafunk at nmsu.edu> wrote:
> Hi, > > > i was wondering if i can get some advice on how to use the DA objec tin > PETSC. > > > Is it possible to create a DA object by inserting a set of boxes into it? > Or can the DA object only be used based on a single rectangular box? > A DA is a single rectangular prism. You could choose not to assign equations to some vertices, or to put the identity there. Matt > say my domain has 2 boxes: > 1) (0,0) - (64,64) > 2) (64,64) - (128,128) > > > Can i "register" those 2 boxes with the object? > > > If that is possible, then is it valid if certain cells/nodes of these boxes > overlap? say they both contain cell/node (64,64)? > > > > If that is possible, and i run in parallel, will the solution on cell/node > (64,64) be returned to both processes (the first owning box1 and the second > box2). > > > > Right now i am building my matrix 'by hand' and i believe the mentioned > "overlap" is causing an ill-conditioned matrix (as addressed earlier in this > list), even through the values on the overlapping nodes are the same. > > > > thanks > matt > > > > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20091008/128594be/attachment.htm>
