Dear all In step-7
https://www.dealii.org/current/doxygen/deal.II/step_7.html under section on "Verification of correctness”, there is this statement (e.g., for linear elements, do not use the QGauss(2) quadrature formula) because solution may exhibit superconvergence at the QGauss(2) points. If we solve -u’’ = 16*pi^2*sin(4*pi*x) in (0,1) u(0) = 0, u(1) = 1 using 8 linear elements and QGauss(2) for quadrature. The error is very small at the vertices of the mesh, not at the QGauss(2) points. Can you look into this issue, is the comment in the documentation wrong, perhaps it should say do not use QGaussLobatto(2) ? Or is there some issue I am missing here ? Thanks praveen -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/919261C0-1E60-44EE-B447-99D92EF8250B%40gmail.com.
