Other than zeroing things out, is there any substantive difference between DMCreateLocalVector and DMGetLocalVector?
-gideon > On Apr 14, 2015, at 7:02 PM, Barry Smith <bsm...@mcs.anl.gov> wrote: > > > When PETSc vectors are created initially they always have 0 everywhere. So > if you use DMCreateLocalVector() it will have zero in all those ghost places > (as well as everywhere else). > > But if you use DMGetLocalVector() it returns vectors that maybe dirty so > you need to fill in any locations you want to have a known value with that > known value. Or call VecSet() to clear the entire vector. > > Barry > >> On Apr 14, 2015, at 5:52 PM, Gideon Simpson <gideon.simp...@gmail.com> wrote: >> >> If i use the DM_BOUNDARY_GHOSTED flag in the creation of a DMDA array, are >> the ghosted values automatically set to zero, or should they be manually set >> to zero if that’s the desired ghost value? >> >> -gideon >> >
