Deepak, I am aware of the fact that ConstraintMatrix.n_constraints() gives the > number of hanging nodes for h-refinement, but if I only use p-refinement, > can it give the number of hanging support points occurring due to the > difference in the order of bases between two adjacent elements? I am > expecting this based on the description of the hp-refinement document. > > I have been trying this but always get 0 hanging support points, although > I know that the some elements of the mesh use Q1, others Q2. > That sounds definitely strange. step-27 uses a hp::DoFHandler and make_hanging_node_constraints. Do you see that constraints are created there? If you can't find a solution looking at that example program, can you reduce your code to a minimal example showing that no constraints are created for p-refinement?
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