--- /dev/null
+//---------------------------- interpolate_rt_01.cc ---------------------------
+// $Id: interpolate_rt_01.cc 12732 2006-03-28 23:15:45Z wolf $
+// Version: $Name$
+//
+// Copyright (C) 2006 by the deal.II authors
+//
+// This file is subject to QPL and may not be distributed
+// without copyright and license information. Please refer
+// to the file deal.II/doc/license.html for the text and
+// further information on this license.
+//
+//---------------------------- interpolate_rt_01.cc ---------------------------
+
+
+// check that VectorTools::interpolate works for RT elements correctly on
+// a uniformly refined mesh for functions of degree q
+
+#include "../tests.h"
+#include <base/function.h>
+#include <base/logstream.h>
+#include <base/quadrature_lib.h>
+#include <lac/vector.h>
+
+#include <grid/tria.h>
+#include <dofs/dof_handler.h>
+#include <dofs/dof_constraints.h>
+#include <grid/grid_generator.h>
+#include <grid/grid_refinement.h>
+#include <grid/tria_accessor.h>
+#include <grid/tria_iterator.h>
+#include <grid/tria_boundary_lib.h>
+#include <dofs/dof_accessor.h>
+#include <dofs/dof_tools.h>
+#include <numerics/vectors.h>
+#include <fe/fe_raviart_thomas.h>
+#include <fe/fe_system.h>
+
+#include <fstream>
+#include <vector>
+
+
+template <int dim>
+class F : public Function<dim>
+{
+ public:
+ F (const unsigned int q,
+ const unsigned int n_components)
+ :
+ Function<dim>(n_components),
+ q(q)
+ {}
+
+ virtual void vector_value (const Point<dim> &p,
+ Vector<double> &v) const
+ {
+ for (unsigned int c=0; c<v.size(); ++c)
+ {
+ v(c) = 0;
+ for (unsigned int d=0; d<dim; ++d)
+ for (unsigned int i=0; i<=q; ++i)
+ v(c) += (d+1)*(i+1)*std::pow (p[d], 1.*i)+c;
+ }
+ }
+
+ private:
+ const unsigned int q;
+};
+
+
+
+template <int dim>
+void test ()
+{
+ Triangulation<dim> triangulation;
+ GridGenerator::hyper_cube (triangulation);
+ triangulation.refine_global (3);
+
+ for (unsigned int p=0; p<6-dim; ++p)
+ {
+ FE_RaviartThomas<dim> fe(p);
+ DoFHandler<dim> dof_handler(triangulation);
+ dof_handler.distribute_dofs (fe);
+
+ deallog << "n_dofs=" << dof_handler.n_dofs() << std::endl;
+
+ ConstraintMatrix constraints;
+ constraints.close ();
+
+ Vector<double> interpolant (dof_handler.n_dofs());
+ Vector<float> error (triangulation.n_active_cells());
+ for (unsigned int q=0; q<=p+2; ++q)
+ {
+ // interpolate the function
+ VectorTools::project (dof_handler,
+ constraints,
+ QGauss<dim>(p+2),
+ F<dim> (q, fe.n_components()),
+ interpolant);
+
+ // then compute the interpolation error
+ VectorTools::integrate_difference (dof_handler,
+ interpolant,
+ F<dim> (q, fe.n_components()),
+ error,
+ QGauss<dim>(std::max(p,q)+1),
+ VectorTools::L2_norm);
+ deallog << fe.get_name() << ", P_" << q
+ << ", rel. error=" << error.l2_norm() / interpolant.l2_norm()
+ << std::endl;
+
+ if (q<=p)
+ Assert (error.l2_norm() < 1e-12*interpolant.l2_norm(),
+ ExcInternalError());
+ }
+ }
+}
+
+
+
+int main ()
+{
+ std::ofstream logfile("interpolate_rt_01/output");
+ logfile.precision (3);
+
+ deallog.attach(logfile);
+ deallog.depth_console(0);
+ deallog.threshold_double(1.e-10);
+
+ test<2>();
+ test<3>();
+}
+
--- /dev/null
+
+DEAL::FESystem<1>[FE_Q<1>(1)^2-FE_Q<1>(2)], P_0, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(1)^2-FE_Q<1>(2)], P_1, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(1)^2-FE_Q<1>(2)], P_2, rel. error=0.000278
+DEAL::FESystem<1>[FE_Q<1>(1)^2-FE_Q<1>(2)], P_3, rel. error=0.000654
+DEAL::FESystem<1>[FE_Q<1>(2)^2-FE_Q<1>(3)], P_0, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(2)^2-FE_Q<1>(3)], P_1, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(2)^2-FE_Q<1>(3)], P_2, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(2)^2-FE_Q<1>(3)], P_3, rel. error=5.15e-06
+DEAL::FESystem<1>[FE_Q<1>(2)^2-FE_Q<1>(3)], P_4, rel. error=1.52e-05
+DEAL::FESystem<1>[FE_Q<1>(3)^2-FE_Q<1>(4)], P_0, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(3)^2-FE_Q<1>(4)], P_1, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(3)^2-FE_Q<1>(4)], P_2, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(3)^2-FE_Q<1>(4)], P_3, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(3)^2-FE_Q<1>(4)], P_4, rel. error=1.20e-07
+DEAL::FESystem<1>[FE_Q<1>(3)^2-FE_Q<1>(4)], P_5, rel. error=4.27e-07
+DEAL::FESystem<1>[FE_Q<1>(4)^2-FE_Q<1>(5)], P_0, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(4)^2-FE_Q<1>(5)], P_1, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(4)^2-FE_Q<1>(5)], P_2, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(4)^2-FE_Q<1>(5)], P_3, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(4)^2-FE_Q<1>(5)], P_4, rel. error=0
+DEAL::FESystem<1>[FE_Q<1>(4)^2-FE_Q<1>(5)], P_5, rel. error=3.21e-09
+DEAL::FESystem<1>[FE_Q<1>(4)^2-FE_Q<1>(5)], P_6, rel. error=1.33e-08
+DEAL::FESystem<2>[FE_Q<2>(1)^2-FE_Q<2>(2)], P_0, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(1)^2-FE_Q<2>(2)], P_1, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(1)^2-FE_Q<2>(2)], P_2, rel. error=8.74e-05
+DEAL::FESystem<2>[FE_Q<2>(1)^2-FE_Q<2>(2)], P_3, rel. error=0.000201
+DEAL::FESystem<2>[FE_Q<2>(2)^2-FE_Q<2>(3)], P_0, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(2)^2-FE_Q<2>(3)], P_1, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(2)^2-FE_Q<2>(3)], P_2, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(2)^2-FE_Q<2>(3)], P_3, rel. error=1.02e-06
+DEAL::FESystem<2>[FE_Q<2>(2)^2-FE_Q<2>(3)], P_4, rel. error=3.01e-06
+DEAL::FESystem<2>[FE_Q<2>(3)^2-FE_Q<2>(4)], P_0, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(3)^2-FE_Q<2>(4)], P_1, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(3)^2-FE_Q<2>(4)], P_2, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(3)^2-FE_Q<2>(4)], P_3, rel. error=0
+DEAL::FESystem<2>[FE_Q<2>(3)^2-FE_Q<2>(4)], P_4, rel. error=2.22e-08
+DEAL::FESystem<2>[FE_Q<2>(3)^2-FE_Q<2>(4)], P_5, rel. error=7.82e-08
+DEAL::FESystem<3>[FE_Q<3>(1)^2-FE_Q<3>(2)], P_0, rel. error=0
+DEAL::FESystem<3>[FE_Q<3>(1)^2-FE_Q<3>(2)], P_1, rel. error=0
+DEAL::FESystem<3>[FE_Q<3>(1)^2-FE_Q<3>(2)], P_2, rel. error=2.52e-05
+DEAL::FESystem<3>[FE_Q<3>(1)^2-FE_Q<3>(2)], P_3, rel. error=5.74e-05
+DEAL::FESystem<3>[FE_Q<3>(2)^2-FE_Q<3>(3)], P_0, rel. error=0
+DEAL::FESystem<3>[FE_Q<3>(2)^2-FE_Q<3>(3)], P_1, rel. error=0
+DEAL::FESystem<3>[FE_Q<3>(2)^2-FE_Q<3>(3)], P_2, rel. error=0
+DEAL::FESystem<3>[FE_Q<3>(2)^2-FE_Q<3>(3)], P_3, rel. error=2.04e-07
+DEAL::FESystem<3>[FE_Q<3>(2)^2-FE_Q<3>(3)], P_4, rel. error=6.07e-07