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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