On Tue, Oct 30, 2012 at 7:41 AM, TAY wee-beng <zonexo at gmail.com> wrote:
> On 28/10/2012 2:17 PM, Jed Brown wrote: > > Algebraic multigrid can be used directly, -pc_type gamg > -pc_gamg_agg_nsmooths 1. Geometric either required that you use the PCMG > interface to set interpolation (and provide a coarse operator for > non-Galerkin) or use a DM that provides coarsening capability. > > What kind of problem are you solving? > > > Hi, > > May I know if there is an example which explains using the geometric MG, > either using PCMG or DM? > SNES ex5 and ex19 both use MG. Matt > Yours sincerely, > > TAY wee-beng > > > On Oct 28, 2012 6:09 AM, "w_ang_temp" <w_ang_temp at 163.com> wrote: > >> Hello, >> I want to use the multigrid as a preconditioner. The introduction >> about it in the manual is little. >> So are there some typical examples or details about multigrid? Is it used >> just like other preconditioners >> like jacobi, sor, which can be simply used in the cammand line options? >> Thanks. >> Jim >> >> >> > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20121030/06c2fdf8/attachment.html>
