I use the P2 and P1 to compare with analytical solution by paraview.
The error of P2 is bigger than P1.
I know that the warning " Finite element variables saved using paraview must be in P0 or P1 ".
Why not use paraview to load P2?
Is it because paraview can only read the vertices, the other three nodes on the border can’t?
And, how to get the data from P2?