I've been meaning to implement this for a while. You can put custom SNES control into a pre-stage or pre-step hook, but this particular case should, in my opinion, be provided as a TS option.
On Wed, Oct 3, 2012 at 11:00 AM, Gong Ding <gdiso at ustc.edu> wrote: > Hi, > I am doing a nonlinear transient simulation. For each time step, a > SNESSolve is called. > I want to do a LU factorization at the first Newton iteration of EACH time > step, and for the following Newton steps (in the same time step), no > factorization any more. For the next time step, the LU factorization should > be done again. > > > SNESSetLagPreconditioner(-1) seems just skips all the following > factorization, even in the different time step. > How can I do? > > > Gong Ding > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20121003/ee2ba7c5/attachment.html>
