From 1ea8121cded7f16d1c11d24a998724e00c76e662 Mon Sep 17 00:00:00 2001 From: bangerth Date: Wed, 1 May 2013 23:03:42 +0000 Subject: [PATCH] More comments. git-svn-id: https://svn.dealii.org/trunk@29421 0785d39b-7218-0410-832d-ea1e28bc413d --- deal.II/include/deal.II/numerics/vector_tools.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/deal.II/include/deal.II/numerics/vector_tools.h b/deal.II/include/deal.II/numerics/vector_tools.h index 36e774ca83..fc583d05b3 100644 --- a/deal.II/include/deal.II/numerics/vector_tools.h +++ b/deal.II/include/deal.II/numerics/vector_tools.h @@ -1983,6 +1983,15 @@ namespace VectorTools * @f{align*} * \textrm{error} = \sqrt{\sum_K \|u-u_h\|_{L_2(K)}^2} * @f} + * Obviously, if you are interested in computing the $L_1$ norm of the + * error, the correct form of the last two lines would have been + * @code + * const double total_local_error = local_errors.l1_norm(); + * const double total_global_error + * = Utilities::MPI::sum (total_local_error); + * @endcode + * instead, and similar considerations hold when computing the $L_\infty$ + * norm of the error. * * @note Instantiations for this template * are provided for some vector types -- 2.39.5