[petsc-users] TSSetIFunction

[Mark Adams]

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.  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.

Thanks,
Mark
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