[petsc-users] Question about using MatSNESMFWPSetComputeNormU

[Matthew Knepley]

On Thu, Aug 18, 2016 at 8:35 AM, 최경준 <kyungjun.choi92 at gmail.com> wrote:

> Hi, I'm trying to set my SNES matrix-free with Walker & Pernice way of
> computing h value.
>
> I found above command (MatSNESMFWPSetComputeNormU) but my fortran compiler
> couldn't fine any reference of that command.
>
> I checked Petsc changes log, but there weren't any mentions about that
> command.
>
> Should I have to include another specific header file?
>

We have this function


http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatMFFDWPSetComputeNormU.html

but I would recommend using the command line option

  *-mat_mffd_compute_normu*

  Thanks,

     Matt

Thank you always.
>



-- 
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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