[petsc-users] How to reorder the local part of the parallel mat?

[Fande Kong]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130116/393f5d3a/attachment.html>