[petsc-users] checking jacobian

[Matthew Knepley]

On Tue, Aug 11, 2015 at 1:04 PM, Gideon Simpson <gideon.simpson at gmail.com>
wrote:

> Macports installation of 3.5.3.
>

Use -help to find the option name. Maybe its -snes_test.

  Thanks,

    Matt


> -gideon
>
> On Aug 11, 2015, at 2:03 PM, Matthew Knepley <knepley at gmail.com> wrote:
>
> 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
>
>
>


-- 
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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