[petsc-dev] handling user domain errors

Jed Brown jed at jedbrown.org
Sat May 2 00:11:14 CDT 2015

Barry Smith <bsmith at mcs.anl.gov> writes:
>   The only other way I see to do it is carry a validity flag around
>   with each vector and reduce that flag in all the vector reductions;
>   but this alone is not enough we would also have to have some
>   propagation code for things like zero pivot, for example setting a
>   validity flag in the Mat factor (saying the factor is not valid) and
>   propagating up those flags. We get all these things "for free" with
>   the Inf Nan approach.

Yeah, NaN/Inf is simple and I think it's okay.  I just wanted to make
sure that the debugging side-effect had been considered.
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