Is it possible to access nodal point values of a solution in deal.ii? And
> is it possible to revise nodal values of a solution pointwise?

Yes, of course, the elements of your solution vector correspond to degrees
of freedoms which are nodal values in your case.
You simply access them (both for read and write) via operator().
DoFTools::map_dofs_to_support_points (
might be useful if you need to know the support point for a given degree of

The tutorial examples show only how to access values of the solution at the
> quadrature points within each cell.
might also be helpful.


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