[petsc-dev] Non-scalable matrix operations

[Matthew Knepley]

On Thu, Dec 29, 2011 at 9:38 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Fri, Dec 23, 2011 at 08:09, Matthew Knepley <knepley at gmail.com> wrote:
>
>> We need ISGlobalToLocalMappingApply(). This could be done with an STL
>> map :)
>>
>
> I'm not convinced it's really necessary, except to work with legacy
> interfaces. But it would be easy to sort the global indices in the
> ISLocalToGlobalMapping so that each lookup could be a binary search.
>

Its necessary to output back into the original ordering from the reordered
partition.

  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
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