Sample code for Prometheus

[Barry Smith]

On Wed, 12 Sep 2007, Farshid Mossaiby wrote:

> Dear users / developers,
> 
> Is there any sample code about Prometheus? 

  It can be used just like any preconditioner in PETSc
so does not need a particular example. You can also 
use PCSetCoordinates() to provide the coordinates of the 
grid points which Prometheus can use to generate 
a better preconditioner.

>And is it
> just a preconditioner, or it can be used as a solver?
 
   If you wish to use it "as a solver" that is, without a 
Krylov method, you simply use -ksp_type richardson. It
is very unlikely this will do better in time then using it
with GMRES or Bi-CG-stab but it is trivial to experiment
to determine what is best for your problem.

   Barry


> Or I am totally wrong?
> 
> Regards,
> Farshid Mossaiby
> 
> 
>        
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