[petsc-users] How to change PC content during Iterations

[Matthew Knepley]

On Mon, Oct 31, 2011 at 10:58 AM, behzad baghapour <
behzad.baghapour at gmail.com> wrote:

> I did it but received this Error when I want to change the level of fill
> for PCILU:
>

Right, you would have to recreate the preconditioner. The SetType() would
not work since
you did not actually change the type.

   Matt


> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Object is in wrong state!
> [0]PETSC ERROR: Cannot change levels after use!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
>
>
>
>
> On Mon, Oct 31, 2011 at 2:19 PM, Matthew Knepley <knepley at gmail.com>wrote:
>
>> On Mon, Oct 31, 2011 at 8:55 AM, behzad baghapour <
>> behzad.baghapour at gmail.com> wrote:
>>
>>> Dear all,
>>>
>>> I'm using KSP iteration (for now) to solve my nonlinear problem and
>>> handling Newton Iterations manually. Here I want to change the PC method
>>> from some specified KSP iteration. How should I do it correctly in Petsc?
>>>
>>
>> Call PCSetType() and then KSPSetOperators() again in your loop
>>
>>    Matt
>>
>>
>>> Thanks, B.B.
>>>
>>> --
>>> ==================================
>>> Behzad Baghapour
>>> Ph.D. Candidate, Mechecanical Engineering
>>> University of Tehran, Tehran, Iran
>>> https://sites.google.com/site/behzadbaghapour
>>> Fax: 0098-21-88020741
>>> ==================================
>>>
>>>
>>
>>
>> --
>> 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
>>
>
>
>
> --
> ==================================
> Behzad Baghapour
> Ph.D. Candidate, Mechecanical Engineering
> University of Tehran, Tehran, Iran
> https://sites.google.com/site/behzadbaghapour
> Fax: 0098-21-88020741
> ==================================
>
>


-- 
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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