[petsc-users] Composite shell preconditiner

[Alexander Grayver]

On 17.08.2012 15:30, Jed Brown wrote:
>
> Sorry, I misinterpreted what you want. PC_COMPOSITE_MULTIPLICATIVE 
> re-evaluates the residual after applying the first stage of the 
> preconditioner. Do you _really_ want to just apply one preconditioner 
> after the next? You can use PC_COMPOSITE_SPECIAL, but read this man 
> page and understand why your preconditioner has that form. 
> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCCompositeType.html

Jed,

I've seen this, but I'm not sure is it fits me.

What I would like to do is very simple: every N iterations I want to 
take current solution vector *x*_i from KSP and calculate:
*x*_i = *x*_i + *c*,
where *c* is a correction vector. I want to be able to apply other 
preconditioners in a usual way.

Is it possible?

-- 
Regards,
Alexander

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