[petsc-users] difference between left and right pc

[Jed Brown]

On Mon, Sep 24, 2012 at 8:36 AM, Klaij, Christiaan <C.Klaij at marin.nl> wrote:

> I can't do that, it's a matshell.


You can use MatComputeExplicitOperator or MatFDColoring to get the entries.
Also, make sure the MATSHELL is really, truly a linear operator. You'll get
very confusing results if you accidentally leave some nonlinearity inside
that function.
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