Dear Jean-Paul,

Thank you very much for your quick reply! I will read it now! 

Best,
Chucui

在 2019年2月21日星期四 UTC+8下午5:17:17,Jean-Paul Pelteret写道:
>
> 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, chucu...@gmail.com <javascript:> 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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