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 (
https://www.dealii.org/current/doxygen/deal.II/namespaceDoFTools.html#a5514e4f59ea659f63953d62ca429eaff
)
might be useful if you need to know the support point for a given degree of
freedom.

The tutorial examples show only how to access values of the solution at the
> quadrature points within each cell.
>
https://github.com/dealii/dealii/wiki/Frequently-Asked-Questions#how-to-get-the-mapped-position-of-support-points-of-my-element
might also be helpful.

Best,
Daniel

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