[petsc-users] TSSetIFunction

[Barry Smith]

> On Dec 12, 2015, at 7:43 AM, Mark Adams <mfadams at lbl.gov> wrote:
> 
> I use TSSetIFunction and put RHS stuff in here, and don't use TSSetRHSFunction.
> 
> This works fine with beuler, but euler gives a zero solution, so I assume explicit solvers do not call TSSetIFunction.

  Correct

>  I assume "I" is for implicit, but I also have a DAE and "When solving DAEs you must use this [TSSetIFunction] function."  I infer that I can not do DAEs explicitly, but I just wanted to check.

  Correct

> 
> Thanks,
> Mark