[petsc-users] questions about PetscSF

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
>> (2) In Algorithms section. Could you please give me a very simple example
>> to demonstrate how  'Extracting a submatrix from a sparse matrix', '
>> Ownership discovery and transfer' and 'Graph distribution'. The description
>> is hard for me to understand.
>>
>
> These are not simple things. What exactly are you looking for? You can see
> graph distribution
> done with PetscSF in DMPlexDistribute().

You might look at MatPermute_MPIAIJ or MatTranspose_MPIAIJ for less
cluttered uses.
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