> 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. --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 > >
