[petsc-users] TS without an RHSJacobian

[Matthew Knepley]

On Sun, May 10, 2015 at 11:26 AM, Gideon Simpson <gideon.simpson at gmail.com>
wrote:

> What happens if I use TS for a nonlinear problem without specifying the
> RHSJacobian?  There’s some mention in the manual that if you’re working
> with a problem built on a da, it will use finite differences to approximate
> it, but I found the language a bit ambiguous.  Could someone elaborate?
>

It should use finite differences and coloring to make the Jacobian.
However, I have not checked whether its actually implemented.
If not, we will do it. I know I put it into IJacobian().

   Matt


>
> -gideon
>

-- 
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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