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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