Dear Prof.Arndt,
Thank you very much! I understand what you say. It helps me a lot!
Best,
Chucui
在 2019年2月21日星期四 UTC+8下午7:31:20，Daniel Arndt写道：
>
> Chucui,
>
>
> For Question 1, I write a code to compute the L2 norm of (solution_1 -
>> solution_2):
>> [...]
>>
>> Is that right?
>>
> You can just take the difference of the two variables and use
> VectorTools::integrate_difference with a Functions::ZeroFunction as "exact
> solution".
>
>
>
>>
>> For question 2, as the 2 solution vectors have different sizes, we don't
>> have the same cells, so the cell loop cannot compute altogether:
>> typename DoFHandler<dim>::active_cell_iterator
>> cell_1 = dof_handler_1.begin_active(),
>> endc_1 = dof_handler_1.end();
>> typename DoFHandler<dim>::active_cell_iterator
>> cell_2 = dof_handler_2.begin_active();
>> for (; cell_1!=endc_2; ++cell_1, ++cell_2)
>> {....}
>>
>> I wander how to solve this problem?
>>
> You need to interpolate the solution computed on the coarser mesh to the
> finer mesh using SolutionTransfer(
> https://www.dealii.org/current/doxygen/deal.II/classSolutionTransfer.html,
> explained e.g. in
> https://www.dealii.org/current/doxygen/deal.II/step_26.html). Then, you
> can take the difference just as in your first question.
>
> Best,
> Daniel
>
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