[petsc-users] An advice on a linear system solution

[Matthew Knepley]

On Mon, Jan 12, 2015 at 10:57 AM, Umut Tabak <u.tabak at tudelft.nl> 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
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