Thanks John -- taht's helpful. Do you also know how I can change the tolerance for dropping elements?
Mohammad On Mon, Jun 20, 2011 at 1:12 PM, John Mousel <john.mousel at gmail.com> wrote: > See the matrix options available in the man pages. I think the function > below is what you are looking for. > > > http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Mat/MatSetOption.html > > > MatSetOption > <http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Mat/MatSetOption.html#MatSetOption>(A,MAT_IGNORE_ZERO_ENTRIES,PETSC_TRUE > > <http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Sys/PETSC_TRUE.html#PETSC_TRUE>); > > > > Best Regards, > John > > > > > On Mon, Jun 20, 2011 at 2:42 PM, Mohammad Mirzadeh <mirzadeh at > gmail.com>wrote: > >> Hi folks, >> >> I've noticed that MatSetValues explicitly inserts zeros in the matrix if >> an element is really zero. Is there a way to drop elements (or not save them >> in the first place) that are below a certain tolerance? I realize one way of >> doing it is in the application code and when using MatSetValues but I'm just >> wondering if PETSc has a function for it? >> >> Thanks, >> Mohammad >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110620/96c98c1f/attachment.htm>
