[petsc-users] Assembly of local Mat's to a parallel Mat

[Matthew Knepley]

On Fri, Apr 12, 2013 at 9:44 AM, Hui Zhang <mike.hui.zhang at hotmail.com>wrote:

> Assembly of local Mat's to a parallel Mat formally defined by A = \sum_i
> Ri^T Ai Ri.
>
> My Ai's are originally defined in sub-communicators.  In Petsc, I was told
> before there are no counterpart of Ri that can promote the mat Ai to
> sup-communicator where A stays. (VecScatter can only acts on Vec but not
> Mat)
>
> So, what is the easiest way to achieve this task?  Note that Ai's are
> already defined in sub-communicators.
>

What are you trying to do? Get the action of A, or assemble it directly?

   Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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