I don’t see it listed in -help, but I do get
./blowup -xmax 50 -nx 1000 -snes_check_jacobian
Testing hand-coded Jacobian, if the ratio is O(1.e-8), the hand-coded
Jacobian is probably correct.
Run with -snes_check_jacobian_view [viewer][:filename][:format] to show
difference of hand-coded and finite difference Jacobian.
63386.1 = ||J - Jfd||//J|| 63386.1 = ||J - Jfd||
-gideon
> On Aug 11, 2015, at 2:07 PM, Matthew Knepley <[email protected]> wrote:
>
> On Tue, Aug 11, 2015 at 1:04 PM, Gideon Simpson <[email protected]
> <mailto:[email protected]>> 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 <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> On Tue, Aug 11, 2015 at 12:51 PM, Gideon Simpson <[email protected]
>> <mailto:[email protected]>> 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 <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>> On Tue, Aug 11, 2015 at 12:49 PM, Gideon Simpson <[email protected]
>>> <mailto:[email protected]>> 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 <[email protected]
>>>> <mailto:[email protected]>> wrote:
>>>>
>>>> Gideon Simpson <[email protected]
>>>> <mailto:[email protected]>> 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
