[petsc-dev] MatAssembly removes all preallocation info

[Matthew Knepley]

On Mon, Sep 25, 2017 at 11:39 AM, Kong, Fande <fande.kong at inl.gov> wrote:

> Hi All,
>
> A matrix is created with the right preallocation, and then MatAssembly is
> called. The preallocation info will be removed. We insert any values then,
> and will encounter an malloc error.
>
> My question is that we was intending to design like this way? Attached
> simple example demonstrates what I am talking about.
>

Yes, this is the intent. Why are you assembling? Could you use
MAT_ASSEMBLY_FLUSH?

  Matt


>
> Fande,
>



-- 
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.caam.rice.edu/~mk51/>
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