[petsc-users] DMLocalToLocal() and DMCoarsen() for DMPlex with Fortran

[Mike Michell]

Hello PETSc developer team,

I am a user of DMPlex in PETSc with Fortran. I have two questions:

- Is DMLocalToLocal() now available for DMPlex with Fortran? I made similar
inquiry before:
https://www.mail-archive.com/petsc-users@mcs.anl.gov/msg44500.html

- Is there any example that can see how DMCoarsen() works? I can see either
src/dm/impls/stag/tutorials/ex4.c  or  src/ksp/ksp/tutorials/ex65.c from
the example folder. However, it is a bit tough to get an idea of how
DMCoarsen() works. What can be the "coarsening" criteria? Is it uniformly
coarsening over the domain? or Can it be variable-gradient based? Having
more examples would be very helpful.

Thanks,
Mike
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