OK, thanks.
On Tue, Jul 15, 2014 at 2:31 PM, Jed Brown <[email protected]> wrote: > Brian Yang <[email protected]> writes: > > > Thanks for the quick reply. > > > > In the main diagonal of Matrix A, it may have some very small values, I > > want to add factor to stabilize it, like: > > > > A + alpha * I > > > http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatShift.html > -- Brian Yang U of Houston
