[petsc-dev] field split error

[Jed Brown]

"Mark F. Adams" <mfadams at lbl.gov> writes:

>> 
>> An IS can start at any number, 
>
> Can it start with a negative number in PETSc?

Not for all uses, but I don't think there is anything in the IS code
that prevents it and it could be useful to discard/skip some entries.
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