On Mon, Jan 12, 2015 at 10:57 AM, Umut Tabak <[email protected]> wrote:
> On 01/12/2015 04:29 PM, Matthew Knepley wrote:
>
>> Fieldsplit block preconditioners can be used on this type of matrix, but
>> success obviously depends on the
>> analytic character of the operators. In particular, if we assume that we
>> have great PCs for the diagonal,
>> then B is the most important variable, and we need to know what the Schur
>> complement
>>
> Dear Matt,
> Thanks, I have a bit of difficult time understanding what you mean by
> ¨great PCs¨ for the diagonal? Could you please rephrase it?
>
My impression was that you knew how to solve the diagonal blocks, but not
the full system.
Thanks,
Matt
> Thanks in advance.
> Umut
>
--
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
