[petsc-users] snes ex12 question about DMPlexProjectFunctionLocal

[Matthew Knepley]

On Thu, Nov 14, 2013 at 7:38 PM, Geoffrey Irving <irving at naml.us> wrote:

> On Thu, Nov 14, 2013 at 5:35 PM, Matthew Knepley <knepley at gmail.com>
> wrote:
> > On Thu, Nov 14, 2013 at 7:32 PM, Geoffrey Irving <irving at naml.us> wrote:
> >>
> >> If this line in ex12 is part of Dirichlet boundary conditions, why is
> >> it done unconditionally even for Neumann?  Is this a mistake that
> >> fails to test correct Neumann conditions?
> >>
> >>     ierr = DMPlexProjectFunctionLocal(dm, user.fe, user.exactFuncs,
> >> INSERT_BC_VALUES, userJ.u);CHKERRQ(ierr);
> >
> > No, its just idempotent in that case.
>
> That's what I meant by fail to test: if there was a bug related to
> null spaces, it wouldn't show up in this example.
>

I do not understand. If you have Neumann conditions, nothing happens, so
it would check that case.

   Matt


> Thanks,
> Geoffrey
>



-- 
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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