[petsc-users] prefix (i.e. cumulative) sum

[Matthew Knepley]

On Tue, Feb 14, 2017 at 2:46 PM, Gideon Simpson <gideon.simpson at gmail.com>
wrote:

> Is there a clever way to handle a prefix (cumulative) sum in petsc?  I
> think I can see how to do with using some underlying MPI, but I was
> wondering if there were some built in routines that could be useful.
>

It is one MPI call (MPI_Scan), but you could do it by assigning sizes to a
PetscLayout (which is how I have done it several places).

  Thanks,

    Matt


> -gideon
>
>


-- 
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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