Also enable multiple components.

git-svn-id: https://svn.dealii.org/trunk@3482 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/deal.II/source/numerics/derivative_approximation.cc b/deal.II/deal.II/source/numerics/derivative_approximation.cc
index 21185db45136bb261852416897587ff3c744e15c..2dc4e1068684296f670a15a1d34033e5fbba437f 100644 (file)
--- a/deal.II/deal.II/source/numerics/derivative_approximation.cc
+++ b/deal.II/deal.II/source/numerics/derivative_approximation.cc
@@ -229,8 +229,6 @@ approximate_derivative (const DoFHandler<dim> &dof_handler,
   Assert (derivative_norm.size() == dof_handler.get_tria().n_active_cells(),
          ExcInvalidVectorLength (derivative_norm.size(),
                                  dof_handler.get_tria().n_active_cells()));
-  Assert (dof_handler.get_fe().n_components() == 1,
-         ExcInternalError());
 
   const unsigned int n_threads = multithread_info.n_default_threads;
   vector<IndexInterval> index_intervals