Thanks, Jed, Could I directly extract a local sub matrix from the parallel matrix? The local part should be a sequential matrix.
On Wed, Jan 16, 2013 at 2:32 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote: > 1. Partition the mesh > 2. Create a sequential matrix representing local mesh adjacency > 3. Use MATORDERINGRCM to get a new ordering for that sequential matrix > 4. Broadcast the new global indices to neighbors > > > On Wed, Jan 16, 2013 at 2:26 PM, Fande Kong <fd.kong at siat.ac.cn> wrote: > >> Barry, Thank you very much. >> >> What I want to do is to order the original mesh. I have partitioned the >> mesh. But I want to reorder the vertices. Thus I create a matrix that >> represent the relationships of the vertices, and then I want to use the >> ordering methods in petsc to reorder the vertices by using matgetordering. >> >> What should I do if I want to use the ordering methods >> (e.g. MATORDERINGRCM ) in petsc to reorder the mesh vertices? >> >> On Wed, Jan 16, 2013 at 1:10 PM, Barry Smith <bsmith at mcs.anl.gov> wrote: >> >>> >>> On Jan 16, 2013, at 1:53 PM, Fande Kong <fd.kong at siat.ac.cn> wrote: >>> >>> > Hi all, >>> > >>> > I create a parallel mat with type MATMPIAIJ, and use the >>> MatGetOrdering to reorder it. But it doesn't work. Who can tell me how to >>> do that? I just want to reorder the local part of the matrix. >>> >>> We don't have code in place for this type of thing. Maybe if you >>> explain why you would like it we could suggest alternatives. >>> >>> Generally we recommend ordering the original mesh appropriately so >>> that the resulting matrices have good orderings and don't recommend >>> reordering the matrices directly (except for direct solvers). >>> >>> Barry >>> >>> > >>> > Thanks, >>> > >>> > -- >>> > Fande Kong >>> > ShenZhen Institutes of Advanced Technology >>> > Chinese Academy of Sciences >>> >>> >>> >> >> >> -- >> Fande Kong >> ShenZhen Institutes of Advanced Technology >> Chinese Academy of Sciences >> > > -- Fande Kong ShenZhen Institutes of Advanced Technology Chinese Academy of Sciences -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130116/c945b337/attachment.html>
