[petsc-users] checking jacobian

[Matthew Knepley]

On Tue, Aug 11, 2015 at 12:51 PM, Gideon Simpson <gideon.simpson at gmail.com>
wrote:

> #End of PETSc Option Table entries
> There is one unused database option. It is:
> Option left: name:-snes_check_jacobian_view (no value)
>

This is the option for the newest release. What are you using?

   Matt


> -gideon
>
> On Aug 11, 2015, at 1:50 PM, Matthew Knepley <knepley at gmail.com> wrote:
>
> 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
>
>
>


-- 
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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