[petsc-users] numerical quadrature

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
> I would use MPI, but I would use
>
>   http://www.mpich.org/static/docs/v3.1/www3/MPI_Scan.html
>
> which will give you all the partial sums at once.

Yes, MPI_Scan if you want the owner of each x to know

  ∫_a^x f

MPI_Allreduce if you want everyone to know

  ∫_a^y f

for a single y known globally.
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