[petsc-users] checking jacobian

[Gideon Simpson]

Macports installation of 3.5.3.

-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 <mailto: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 <mailto:knepley at gmail.com>> wrote:
>> 
>> On Tue, Aug 11, 2015 at 12:49 PM, Gideon Simpson <gideon.simpson at gmail.com <mailto: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 <mailto:jed at jedbrown.org>> wrote:
>>> 
>>> Gideon Simpson <gideon.simpson at gmail.com <mailto: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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