Hello all, I couldn't find references on how to do p-refinement only with deal.II. I am thinking to use it for a really simple test. I have two discrete solutions to my problem, one of which is order 2, and the other is order 1, obtained using different numerical methods, on the same mesh. I would like to project the 2nd order solution to 1st order and then compare the results (take the norm of the difference, say). I tried VectorTools::project and VectorTools::interpolate, but they fail since (altough the mesh is the same for both solutions), the number of DoFs is not.
How could I project sol_2 to 1st order? Thank you! Mihai
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