[petsc-dev] TS Terminology

[Matthew Knepley]

On Fri, Oct 20, 2017 at 4:21 PM, Jed Brown <jed at jedbrown.org> wrote:

> Matthew Knepley <knepley at gmail.com> writes:
>
> >> Note that TSComputeIFunction is very much like SNESComputeFunction,
> >> which includes
> >>
> >>   if (snes->vec_rhs) {
> >>     ierr = VecAXPY(y,-1.0,snes->vec_rhs);CHKERRQ(ierr);
> >>   }
> >>
> >> Why haven't you complained about that?
> >>
> >
> > Good point. I did not notice. This came up because the initialization
> > of input vectors is inconsistent between TSComputeIFunction() and
> > TSComputeIFunctionLocal(). The former does not zero the output vec,
> > but the later does.
>
> The latter function doesn't exist so maybe you mean
> TSComputeIFunction_DMDA with ADD_VALUES?  That's because the DMDA needs
> it when using ADD_VALUES, just like SNESComputeFunction_DMDA.  When
> using INSERT_VALUES, the user is responsible for setting every entry.
> Is any of this different from SNES?
>

No I mean TSComputeIFunction_DMLocal(). So if you use DMTSSetIFunction()
you get
different initialization behavior than if you use DMTSSetIFunctionLocal().
This is what Brad
was complaining about originally.

   Matt

-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/~mk51/>
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