[petsc-dev] Can someone explain what is going on here?

[Matthew Knepley]

https://bitbucket.org/petsc/petsc/src/ff331c249a8bbf694711b310f25fec0e839b33db/src/ksp/ksp/interface/itfunc.c?at=master#cl-202

Dave has a DMComposite which he splits using FS, but then he wants
to use GMG on the velocity block. He manually sets the DM, but this
wipes out the matrix which FS set there.

Do we have a clear explanation of what setting a DM on the solver does?

  Thanks,

    Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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