[petsc-users] Determining maximum number of columns in sparse matrix

[Alexander Lindsay]

This is great. Thanks Matt!

On Sun, Nov 6, 2022 at 2:35 PM Matthew Knepley <knepley at gmail.com> wrote:

> On Sun, Nov 6, 2022 at 5:31 PM Alexander Lindsay <alexlindsay239 at gmail.com>
> wrote:
>
>> We sometimes overallocate our sparsity pattern. Matrix assembly will
>> squeeze out allocations that we never added into/set. Is there a convenient
>> way to determine the size of the densest row post-assembly? I know that we
>> could iterate over rows and call `MatGetRow` and figure it out that way.
>> But I'm wondering if there is a better way?
>>
>
> You could use https://petsc.org/main/docs/manualpages/Mat/MatGetRowIJ/
> which gives all the row lengths at once.
>
>   Thanks,
>
>      Matt
>
>
>> Alex
>>
>
>
> --
> 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
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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