[petsc-users] checking jacobian

[Matthew Knepley]

On Tue, Aug 11, 2015 at 12:49 PM, Gideon Simpson <gideon.simpson at gmail.com>
wrote:

> Maybe it’s a quirk of the macports installation of petsc, but nothing
> seems to be getting generated.
>

Run with -options_left. Is it reading the option?

  Matt


> -gideon
>
> On Aug 11, 2015, at 1:40 PM, Jed Brown <jed at jedbrown.org> wrote:
>
> Gideon Simpson <gideon.simpson at gmail.com> writes:
>
> I’m a bit confused by the following options:
>
> Run with -snes_check_jacobian_view [viewer][:filename][:format] to show
> difference of hand-coded and finite difference Jacobian.
>
> What flags do I pass it to get some output to diagnose my Jacobian error?
>
>
> Nothing to display ASCII to the screen.  You might use
> "binary:thematrix" if you want to read it in with Python or MATLAB, for
> example.
>
>
>


-- 
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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