On Tue, Jun 19, 2012 at 10:33 AM, Margarita Satraki < margarita.satraki at gmail.com> wrote:
> Hello, > > I have difficulty understanding how PCKSP works. > > From: > > http://www.mcs.anl.gov/petsc/documentation/tutorials/Columbia04/DDandMultigrid.pdf > I understand that instead of using preconditioners, it uses Krylov methods > for the ''inner solvers''. > > What are the ''inner solvers''? Is there some kind of a subsystem that is > solved instead of applying a preconditioner? > Nope, its jsut like a PC: M^{-1} A x = M^{-1} b where now M^{-1} instead of being an LU solve, for instance, is a Krylov solve. Matt > Many thanks, > > Margarita > -- 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/20120619/d2a240aa/attachment.html>
