Using -pctype mg -pcmgtype PC_MG_MULTIPLICATIVE

[Matthew Knepley]

The multigrid PC needs information about the grid and discretization. If you
cannot provide this, use AMG through Hypre or ML. Or if you have a
structured grid, consider using DMMG.

  Thanks,

    Matt

On 8/15/07, Ben Tay <zonexo at gmail.com> wrote:
> Hi,
>
> I found that there's a multigrid option in the manual which can be used
> by adding -pctype mg -pcmgtype PC_MG_MULTIPLICATIVE.
>
> However, it seems that I am actually just using LU since with or without
> this option, I got exactly the same answer. Am I using multigrid the
> wrong way?
>
> Thanks
>
>


-- 
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