Hi to everyone!I computed a 2D velocity field U based on P2 elements. I computed its gradient with the function:getfem::compute_gradient(mf1, mf2, U, V), where mf1 is P2 element, mf2 is P1 element, U is the velocity vector and V is the vector containing the gradient which dimensions are 2*mf2.nb_dof() as prescribed by the userguide. It seems to work. Now, I would export the gradient field in .vtk. How can I do?Thank you,Nora
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