[petsc-dev] MatCreateSubMatrix question

[Mark Adams]

I have a parallel matrix and I want to extract parts of it locally to
create small local matrices.

I use PETSC_COMM_SELF for the ISs, but that does not seem to be enough to
tell MatCreateSubMatrix that I want a PETSC_COMM_SELF (sub)matrix.

How should I do this?

I am not doing any communication in this process. Could I just wrap the
local part of the parallel matrix into a PETSC_COMM_SELF matrix?

Thanks,
Mark
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