[petsc-users] Solving with SNES

behzad baghapour behzad.baghapour at gmail.com
Sat Nov 12 12:29:48 CST 2011

OK. I try to following this procedure.
Thanks a lot.

On Sat, Nov 12, 2011 at 9:57 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Sat, Nov 12, 2011 at 12:22, behzad baghapour <
> behzad.baghapour at gmail.com> wrote:
>> So, after a line-search update in newton iteration, I should in some way
>> pass the updated values into my objects (elements) so that the FormJacobian
>> and FormFunctions use these objects for the next newton iteration.
> No. It's very simple. Put work arrays in a context and set that context
> for both FormFunction() and FormJacobian().
> In FormFunction(): do NOT assume that anything useful is in the work
> array. You can't possibly put something semantically meaningful, so treat
> them as uninitialized memory. THIS function puts the useful stuff into the
> work arrays. You can do it at the start of the function or you can do it
> "while" computing the residual.
> In FormJacobian(): use the values that were placed in the work arrays by
> FormFunction().
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