[petsc-users] Size of off-diagonal matrix

[Jed Brown]

On Thu, Jun 23, 2011 at 16:47, John Fettig <john.fettig at gmail.com> wrote:

> I'm trying to use MatCreateMPIAIJWithSplitArrays, but it isn't clear
> to me how the off-diagonal portion is supposed to be constructed.
>

Okay, it's defined by compressing all the sorted off-process entries and
then defining the sequential matrix operating on those values.

Unless you already happen to use the same format, you're better off using
MatSetValues().
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