Ok, thanks for the clarification. On Thu, Apr 6, 2023 at 10:25 AM Matthew Knepley <knep...@gmail.com> wrote:
> On Thu, Apr 6, 2023 at 10:21 AM Takahashi, Tadanaga <t...@njit.edu> wrote: > >> I am following up from the last inquiry. I read the source code nasm.c >> <https://petsc.org/release/src/snes/impls/nasm/nasm.c.html> and it looks >> like sub-snes iteration is being initialized with a scatter call from the >> previous solution. In other words, if I use Newton's method for the local >> solver, then in each NASM iteration the Newton's method uses the previous >> local solution as the initial guess. Can anyone confirm this? >> > > This is the intention. There are not many tests, so it is possible there > is a bug, but it is supposed to use the existing solution. > > Thanks, > > Matt > > >> On Sun, Apr 2, 2023 at 6:14 PM Takahashi, Tadanaga <t...@njit.edu> wrote: >> >>> Hello PETSc devs, >>> >>> I am using SNES NASM with Newton LS on the sub-SNES. I was wondering how >>> the sub-SNES chooses the initial guess during each NASM iteration. Is it >>> using the previously computed solution or is it restarting from zero? >>> >> > > -- > 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 > > https://www.cse.buffalo.edu/~knepley/ > <http://www.cse.buffalo.edu/~knepley/> >
