[petsc-users] Error Norm_2

[Matthew Knepley]

On Mon, Feb 25, 2019 at 4:56 PM Fazlul Huq via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hello PETSc Developers,
>
> I have solved a very simple poisson problem with different matrix sizes
> (10 to 10^7).
> But when I have compared error norm_2 for the solution, I got the attached
> curve.
> It looks like error norm_2 increases with increasing matrix size.
> Shouldn't it decrease rather with increasing matrix size?
>

Yes that is completely wrong.

  Matt


> Thanks.
>
> Sincerely,
> Huq
> --
>
> Fazlul Huq
> Graduate Research Assistant
> Department of Nuclear, Plasma & Radiological Engineering (NPRE)
> University of Illinois at Urbana-Champaign (UIUC)
> E-mail: huq2090 at gmail.com
>


-- 
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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