Jarkwang, Quadrature points and support points only coincide in special cases. In particular, this not true for Gauss quadrature of order fe_degree+1 and FE_Q elements.
When computing errors, you often want to avoid superconvergence effects and hence use a quadrature rule different from the one chosen for assembling system matrix and right-hand side. Have a look at the discussion in step-7 [1] for this. Best, Daniel [1] https://www.dealii.org/8.4.1/doxygen/deal.II/step_7.html#Verificationofcorrectness -- 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. For more options, visit https://groups.google.com/d/optout.
