[petsc-dev] Mat/DM dependency

[Jed Brown]

On Tue, 5 Jan 2010 14:24:36 -0600, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:
> So an assembled MatFwk would store these block index arrays internally
> (and, possibly, R_ks matrix entries, if we need more than just
> ADD_VALUES, as is the case for BDDC

How is something other than ADD_VALUES necessary for BDDC?  Once the
primal space is identified, each entry in the global numbering becomes
split between a local unassembled part and a global assembled part.  So
P_k,R_k are not 1-1, but we still use ADD_VALUES.

Jed