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
