Hi Chucui,
I can only offer you a very brief reply right now: You might want to look into
the ConvergenceTable
<https://www.dealii.org/9.0.0/doxygen/deal.II/classConvergenceTable.html> class
to help you with (1). The introduction to the class directs you to some
tutorials that indicate its use.
Best,
Jean-Paul
> On 21 Feb 2019, at 10:11, chucui1...@gmail.com wrote:
>
> Hi all,
>
> I have 2 questions of computing convergence rate of L2 norm of error:
>
> 1. If I don't have exact solution, does deal.ii have functions to compute
> convergence rate directly? (Like VectorTools::integrate_difference, which
> deals with the problem with exact solution )
>
> 2. If I want to compute convergence rate of error of solutions with
> different globally refinement (u_{h}-u_{h/2}, u_{h/2}-u_{h/4}, and so on ),
> does deal.ii have functions to compute convergence rate directly?
> if not, how to deal with computing u_{h}-u_{h/2}, where the 2 numerical
> solution have different size of vector?
>
> Thanks in advance!
>
> Best,
> Chucui
>
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