[petsc-users] Solving upper triangular system with pc fieldsplit

[Matthew Knepley]

On Mon, Aug 20, 2012 at 7:18 AM, Thomas Witkowski <
thomas.witkowski at tu-dresden.de> wrote:

>  Am 20.08.2012 13:39, schrieb Matthew Knepley:
>
> On Mon, Aug 20, 2012 at 3:09 AM, Thomas Witkowski <
> thomas.witkowski at tu-dresden.de> wrote:
>
>> Is it possible to change the PCFIELDSPLIT / block Gauss-Seidel
>> preconditioner to use A_01 instead of A_10 to solve an upper triangular
>> system?
>
>
>  It always uses A_01. What exactly do you want to do?
>
> In this case the documentation should be changed (see p. 86)
>

I did not understand your question. The correct answer is: You can define
fields
in any order.

   Matt


> Thomas
>
>
>     Matt
>
>
>>
>> Thomas
>>
>
>
>
>  --
> 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
>
>
>


-- 
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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