Matthew Knepley <[email protected]> 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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