[petsc-users] Can I use the direct solver without providing the analytical Jacobian?

[Matthew Knepley]

On Wed, Mar 23, 2011 at 11:46 AM, Rebecca Xuefei Yuan
<xy2102 at columbia.edu>wrote:

> Hi,
>
> If the nonlinear system is evaluated at F(u) = 0 in "FormFunction()", but
> the symbolic Jacobian is not provided. Is there any options that I can call
> to solve the corresponding linear system by direct solver?
>

-snes_fd, which is very slow.

  Matt


> Thanks very much!
>
> Best regards,
>
> Rebecca
>
>
>


-- 
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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