Is DMMGSolve in Petsc a Newton-multigrid?

[(Rebecca) Xuefei YUAN]

Dear Matt,

Does that mean mg is only used as a pc so far? Where could I check on  
which smoother it uses and options Petsc provided for dmmg? There is  
not much information on the user manual.

Thanks,

Rebecca


Quoting Matthew Knepley <knepley at gmail.com>:

> On Wed, Jul 22, 2009 at 3:18 PM, (Rebecca) Xuefei YUAN
> <xy2102 at columbia.edu>wrote:
>
>> Is Newton iteration for the outer iterations and multigrid for the linear
>> inner iterations?
>
>
> This is the usual formulation:
>
>   Newton to solve F(u) = 0
>
> and
>
>   Multigrid to precondition F'(u) \delta u = -F(u)
>
>   Matt
>
>
>>
>> Thanks
>>
>> --
>> (Rebecca) Xuefei YUAN
>> Department of Applied Physics and Applied Mathematics
>> Columbia University
>> Tel:917-399-8032
>> www.columbia.edu/~xy2102 <http://www.columbia.edu/%7Exy2102>
>>
> --
> 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
>



-- 
(Rebecca) Xuefei YUAN
Department of Applied Physics and Applied Mathematics
Columbia University
Tel:917-399-8032
www.columbia.edu/~xy2102