[petsc-users] Identifying matching points in differently distributed DMPlexs

[Matthew Knepley]

On Tue, Feb 19, 2019 at 11:00 AM Lawrence Mitchell via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Dear petsc-users,
>
> I have two (different) distributions of the (topologically) same DMPlex
> object (DM_a and DM_b).
>
> I would like to identify the map from points(DM_a) to points(DM_b) such
> that I can transfer fields between the two.
>
> Does such a facility exist?
>

Case #1: You made DM_b from DM_a

  Then you are fine. The PetscSF you get from Distribute() is the map.

Case #2: They are completely unconnected

  This is hard. I wrote code to do it at least twice, but I keep throwing
it away when I rewrite things because
it is so ugly. Hopefully you do not need this.

  Thanks,

     Matt


> Lawrence



-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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