[petsc-users] Automatic Differentiation

[Harshad Sahasrabudhe]

I haven't tried the FD Jacobian. How do I enable that? I have been
providing the Jacobian.

On Tue, Jun 2, 2015 at 4:59 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Tue, Jun 2, 2015 at 3:55 PM, Harshad Sahasrabudhe <hsahasra at purdue.edu>
> 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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20150602/b91a1f9d/attachment.html>