On Mon, Feb 27, 2012 at 11:28, Matthew Knepley <knepley at gmail.com> wrote:
> PetscErrorCode SNESDMComputeJacobian(SNES snes,Vec X,Mat *J,Mat
>> *B,MatStructure *flag,void *ptr)
>> {
>> PetscErrorCode ierr;
>> DM dm;
>>
>> PetscFunctionBegin;
>> ierr = SNESGetDM(snes,&dm);CHKERRQ(ierr);
>> ierr = DMComputeJacobian(dm,X,*J,*B,flag);CHKERRQ(ierr);
>> PetscFunctionReturn(0);
>> }
>>
>
> I thought the idea was for the solver to come in through the context
> argument of the user callback. Maybe there should be
> a structured way to for SNES to modify the DM context which it passes to
> the user callback.
>
The way the code is written, there is no user context. The user can call
DMGetApplicationContext() if they want one, _but_ that should not contain a
SNES or TS. The application context should only contain
resolution-independent parameters.
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