On Tue, Feb 12, 2013 at 11:17 PM, Matthew Knepley <knepley at gmail.com> wrote:
> Yes. PetscSection represents groups of numbers, and you can see the > grouping. > IS is a map from (int) -> (int), but PetscSection is a map from (int) -> (int,int) where the pair is interpreted to mean an interval of non-negative extent. If it's any use, an IS could be thought of as the special case (int) -> (int,1). > > >> What queries "do not just return members of this list" in PETSc >> section? (That is queries we wish to retain anyways). > > > For example, you can ask "how many items are in group p?". This is > crucial, and the whole point of the structure. > I don't see how you can recover that information from just the list of dof > numbers. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20130212/7c1205e6/attachment.html>
