[petsc-users] Insert values into matrix using MatSetValuesStencil or MatSetValuesLocal

[Wee-Beng Tay]

Hi,

I'm modifying my 3d fortran code from MPI along 1 direction (z) to MPI
along 2 directions (y,z)

Previously I was using MatSetValues with global indices. However, now I'm
using DM and global indices is much more difficult.

I come across MatSetValuesStencil or MatSetValuesLocal.

So what's the difference bet the one since they both seem to work locally?

Which is a simpler/better option?

Is there an example in Fortran for MatSetValuesStencil?

Do I also need to use DMDAGetAO together with MatSetValuesStencil or
MatSetValuesLocal?

Thanks!
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