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//
// Copyright (C) 2010 - 2015 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef dealii__mesh_worker_functional_h
#define dealii__mesh_worker_functional_h
#include <deal.II/algorithms/any_data.h>
#include <deal.II/base/smartpointer.h>
#include <deal.II/base/mg_level_object.h>
#include <deal.II/lac/block_vector.h>
#include <deal.II/meshworker/dof_info.h>
#include <deal.II/multigrid/mg_constrained_dofs.h>
DEAL_II_NAMESPACE_OPEN
namespace MeshWorker
{
namespace Assembler
{
/**
* The class assembling local contributions to a functional into global
* functionals.
*
*
*
* @ingroup MeshWorker
* @author Guido Kanschat, 2009
*/
template <typename number = double>
class Functional
{
public:
/**
* Initialize local data to store functionals. The number <tt>n</tt> is
* the number of functionals to be computed.
*/
void initialize(const unsigned int n);
/**
* Initialize the local data in the DoFInfo object used later for
* assembling.
*
* The info object refers to a cell if <code>!face</code>, or else to an
* interior or boundary face.
*/
template <class DOFINFO>
void initialize_info(DOFINFO &info, bool face);
/**
* Assemble the local values into the global vectors.
*/
template<class DOFINFO>
void assemble(const DOFINFO &info);
/**
* Assemble both local values into the global vectors.
*/
template<class DOFINFO>
void assemble(const DOFINFO &info1,
const DOFINFO &info2);
/**
* The value of the ith entry in #results.
*/
number operator() (const unsigned int i) const;
private:
/**
* The values into which the results are added.
*/
std::vector<double> results;
};
/**
* Compute cell and face contributions of one or several functionals,
* typically for error estimates.
*
* @ingroup MeshWorker
* @author Guido Kanschat, 2009
*/
template <typename number = double>
class CellsAndFaces
{
public:
/**
* The initialization function, specifying the @p results vectors and
* whether face data should be collected separately.
*
* @p results should contain two block vectors named "cells" and "faces"
* (the latter only if @p separate_faces is true). In each of the two,
* each block should have equal size and be large enough to accommodate
* all user indices set in the cells and faces covered by the loop it is
* used in. Typically, for estimators, this is
* Triangulation::n_active_cells() and Triangulation::n_faces(),
* respectively.
*
* The use of BlockVector may seem cumbersome, but it allows us to
* assemble several functionals at the same time, one in each block. The
* typical situation for error estimate is just having a single block in
* each vector.
*/
void initialize(AnyData &results, bool separate_faces = true);
/**
* Initialize the local data in the DoFInfo object used later for
* assembling.
*
* The info object refers to a cell if <code>!face</code>, or else to an
* interior or boundary face.
*/
template <class DOFINFO>
void initialize_info(DOFINFO &info, bool face) const;
/**
* Assemble the local values into the global vectors.
*/
template<class DOFINFO>
void assemble(const DOFINFO &info);
/**
* Assemble both local values into the global vectors.
*/
template<class DOFINFO>
void assemble(const DOFINFO &info1,
const DOFINFO &info2);
/**
* The value of the ith entry in @p results.
*/
number operator() (const unsigned int i) const;
private:
AnyData results;
bool separate_faces;
};
//----------------------------------------------------------------------//
template <typename number>
inline void
Functional<number>::initialize(const unsigned int n)
{
results.resize(n);
std::fill(results.begin(), results.end(), 0.);
}
template <typename number>
template <class DOFINFO>
inline void
Functional<number>::initialize_info(DOFINFO &info, bool)
{
info.initialize_numbers(results.size());
}
template <typename number>
template <class DOFINFO>
inline void
Functional<number>::assemble(const DOFINFO &info)
{
for (unsigned int i=0; i<results.size(); ++i)
results[i] += info.value(i);
}
template <typename number>
template <class DOFINFO>
inline void
Functional<number>::assemble(const DOFINFO &info1,
const DOFINFO &info2)
{
for (unsigned int i=0; i<results.size(); ++i)
{
results[i] += info1.value(i);
results[i] += info2.value(i);
}
}
template <typename number>
inline number
Functional<number>::operator() (const unsigned int i) const
{
AssertIndexRange(i, results.size());
return results[i];
}
//----------------------------------------------------------------------//
template <typename number>
inline void
CellsAndFaces<number>::initialize(AnyData &r, bool sep)
{
Assert(r.name(0) == "cells", AnyData::ExcNameMismatch(0, "cells"));
if (sep)
{
Assert(r.name(1) == "faces", AnyData::ExcNameMismatch(1, "faces"));
AssertDimension(r.entry<BlockVector<double>*>(0)->n_blocks(),
r.entry<BlockVector<double>*>(1)->n_blocks());
}
results = r;
separate_faces = sep;
}
template <typename number>
template <class DOFINFO>
inline void
CellsAndFaces<number>::initialize_info(DOFINFO &info, bool) const
{
info.initialize_numbers(results.entry<BlockVector<double>*>(0)->n_blocks());
}
template <typename number>
template <class DOFINFO>
inline void
CellsAndFaces<number>::assemble(const DOFINFO &info)
{
BlockVector<double> *v;
if (separate_faces &&
info.face_number != numbers::invalid_unsigned_int)
v = results.entry<BlockVector<double>*>(1);
else
v = results.entry<BlockVector<double>*>(0);
for (unsigned int i=0; i<info.n_values(); ++i)
v->block(i)(info.cell->user_index()) += info.value(i);
}
template <typename number>
template <class DOFINFO>
inline void
CellsAndFaces<number>::assemble(const DOFINFO &info1,
const DOFINFO &info2)
{
for (unsigned int i=0; i<info1.n_values(); ++i)
{
if (separate_faces)
{
BlockVector<double> *v1 = results.entry<BlockVector<double>*>(1);
const double J = info1.value(i) + info2.value(i);
v1->block(i)(info1.face->user_index()) += J;
if (info2.face != info1.face)
v1->block(i)(info2.face->user_index()) += J;
}
else
{
BlockVector<double> *v0 = results.entry<BlockVector<double>*>(0);
v0->block(i)(info1.cell->user_index()) += .5*info1.value(i);
v0->block(i)(info2.cell->user_index()) += .5*info2.value(i);
}
}
}
}
}
DEAL_II_NAMESPACE_CLOSE
#endif
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