On Tue, Jun 2, 2015 at 4:05 PM, Harshad Sahasrabudhe <[email protected]>
wrote:
> I haven't tried the FD Jacobian. How do I enable that? I have been
> providing the Jacobian.
>
Just do not provide the Jacobian. It will turn on.
Thanks,
Matt
> On Tue, Jun 2, 2015 at 4:59 PM, Matthew Knepley <[email protected]> wrote:
>
>> On Tue, Jun 2, 2015 at 3:55 PM, Harshad Sahasrabudhe <[email protected]
>> > wrote:
>>
>>> Hi,
>>>
>>> Does PETSc have automatic differentiation capability? I'm solving an
>>> elliptic non-linear equation in which calculating the correct Jacobian is
>>> extremely demanding. The system doesn't converge with an approximate
>>> Jacobian. Is there any SNES solver I should try which doesn't use a
>>> Jacobian?
>>>
>>
>> Do you mean it does not converge with the default FD Jacobian?
>>
>> Matt
>>
>>
>>> Thanks,
>>> Harshad
>>>
>>
>>
>>
>> --
>> 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
