On Sun, Mar 24, 2013 at 6:35 AM, Nico Schl?mer <nico.schloemer at gmail.com>wrote:
> > > http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatSetBlockSize.html > > Thanks! > > > For complex-valued problems, you're likely better off using complex > numbers. > > Does PETSc support complex arithmetic natively? That'd be another > reason for getting complex-value support into FEniCS. Yes. Matt > > --Nico > > > > On Sat, Mar 23, 2013 at 8:29 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote: > > > http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatSetBlockSize.html > > > > PCML, PCHYPRE, and PCGAMG pay attention to this parameter if no richer > > information (like near-null spaces) is provided. > > > > For complex-valued problems, you're likely better off using complex > numbers. > > > > > > On Sat, Mar 23, 2013 at 2:25 PM, Nico Schl?mer <nico.schloemer at gmail.com > > > > wrote: > >> > >> Hi, > >> > >> I've got this linear system consisting of 2x2 blocks (acutally coming > >> from a real-imaginary formulation of a complex-valued problem) and I'd > >> like to precondition the linear solves with AMG. Things are already > >> working well when taking the defaults, but I guess one could achieve > >> way better when telling AMG about the 2x2 structure. Trilinos' ML does > >> this by a parameter "PDE equations". -- Is there something comparable > >> in the PETSc world? > >> > >> --Nico > > > > > -- 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/20130324/d5f598b4/attachment.html>
