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// $Id: mg_transfer.h 30040 2013-07-18 17:06:48Z maier $
//
// Copyright (C) 2001 - 2013 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 __deal2__mg_transfer_h
#define __deal2__mg_transfer_h
#include <deal.II/base/config.h>
#include <deal.II/lac/block_vector.h>
#include <deal.II/lac/constraint_matrix.h>
#include <deal.II/lac/sparse_matrix.h>
#include <deal.II/lac/block_sparsity_pattern.h>
#include <deal.II/lac/trilinos_sparse_matrix.h>
#include <deal.II/lac/vector_memory.h>
#include <deal.II/multigrid/mg_base.h>
#include <deal.II/multigrid/mg_constrained_dofs.h>
#include <deal.II/base/mg_level_object.h>
#include <deal.II/dofs/dof_handler.h>
#include <deal.II/base/std_cxx1x/shared_ptr.h>
DEAL_II_NAMESPACE_OPEN
template <int dim, int spacedim> class DoFHandler;
namespace internal
{
template <class VECTOR>
struct MatrixSelector
{
typedef ::dealii::SparsityPattern Sparsity;
typedef ::dealii::SparseMatrix<typename VECTOR::value_type> Matrix;
template <class CSP, class DH>
static void reinit(Matrix &matrix, Sparsity &sparsity, int level, const CSP &csp, const DH &)
{
sparsity.copy_from (csp);
matrix.reinit (sparsity);
}
};
#ifdef DEAL_II_WITH_TRILINOS
template <>
struct MatrixSelector<dealii::TrilinosWrappers::MPI::Vector>
{
typedef ::dealii::TrilinosWrappers::SparsityPattern Sparsity;
typedef ::dealii::TrilinosWrappers::SparseMatrix Matrix;
template <class CSP, class DH>
static void reinit(Matrix &matrix, Sparsity &sparsity, int level, const CSP &csp, DH &dh)
{
matrix.reinit(dh.locally_owned_mg_dofs(level+1),
dh.locally_owned_mg_dofs(level),
csp, MPI_COMM_WORLD, true);
}
};
template <>
struct MatrixSelector<dealii::TrilinosWrappers::Vector>
{
typedef ::dealii::TrilinosWrappers::SparsityPattern Sparsity;
typedef ::dealii::TrilinosWrappers::SparseMatrix Matrix;
template <class CSP, class DH>
static void reinit(Matrix &matrix, Sparsity &sparsity, int level, const CSP &csp, DH &dh)
{
}
};
#endif
}
/*
* MGTransferBase is defined in mg_base.h
*/
/*!@addtogroup mg */
/*@{*/
/**
* Implementation of the MGTransferBase interface for which the transfer
* operations are prebuilt upon construction of the object of this class as
* matrices. This is the fast way, since it only needs to build the operation
* once by looping over all cells and storing the result in a matrix for
* each level, but requires additional memory.
*
* See MGTransferBase to find out which of the transfer classes
* is best for your needs.
*
* @author Wolfgang Bangerth, Guido Kanschat
* @date 1999, 2000, 2001, 2002, 2003, 2004, 2012
*/
template <class VECTOR>
class MGTransferPrebuilt : public MGTransferBase<VECTOR>
{
public:
/**
* Constructor without constraint
* matrices. Use this constructor
* only with discontinuous finite
* elements or with no local
* refinement.
*/
MGTransferPrebuilt ();
/**
* Constructor with constraint matrices as well as mg_constrained_dofs.
*/
MGTransferPrebuilt (const ConstraintMatrix &constraints,
const MGConstrainedDoFs &mg_constrained_dofs);
/**
* Destructor.
*/
virtual ~MGTransferPrebuilt ();
/**
* Actually build the prolongation
* matrices for each level.
*/
template <int dim, int spacedim>
void build_matrices (const DoFHandler<dim,spacedim> &mg_dof);
virtual void prolongate (const unsigned int to_level,
VECTOR &dst,
const VECTOR &src) const;
virtual void restrict_and_add (const unsigned int from_level,
VECTOR &dst,
const VECTOR &src) const;
/**
* Transfer from a vector on the
* global grid to vectors defined
* on each of the levels
* separately, i.a. an @p MGVector.
*/
template <int dim, class InVector, int spacedim>
void
copy_to_mg (const DoFHandler<dim,spacedim> &mg_dof,
MGLevelObject<VECTOR> &dst,
const InVector &src) const;
/**
* Transfer from multi-level vector to
* normal vector.
*
* Copies data from active
* portions of an MGVector into
* the respective positions of a
* <tt>Vector<number></tt>. In order to
* keep the result consistent,
* constrained degrees of freedom
* are set to zero.
*/
template <int dim, class OutVector, int spacedim>
void
copy_from_mg (const DoFHandler<dim,spacedim> &mg_dof,
OutVector &dst,
const MGLevelObject<VECTOR> &src) const;
/**
* Add a multi-level vector to a
* normal vector.
*
* Works as the previous
* function, but probably not for
* continuous elements.
*/
template <int dim, class OutVector, int spacedim>
void
copy_from_mg_add (const DoFHandler<dim,spacedim> &mg_dof,
OutVector &dst,
const MGLevelObject<VECTOR> &src) const;
/**
* If this object operates on
* BlockVector objects, we need
* to describe how the individual
* vector components are mapped
* to the blocks of a vector. For
* example, for a Stokes system,
* we have dim+1 vector
* components for velocity and
* pressure, but we may want to
* use block vectors with only
* two blocks for all velocities
* in one block, and the pressure
* variables in the other.
*
* By default, if this function
* is not called, block vectors
* have as many blocks as the
* finite element has vector
* components. However, this can
* be changed by calling this
* function with an array that
* describes how vector
* components are to be grouped
* into blocks. The meaning of
* the argument is the same as
* the one given to the
* DoFTools::count_dofs_per_component
* function.
*/
void
set_component_to_block_map (const std::vector<unsigned int> &map);
/**
* Finite element does not provide prolongation matrices.
*/
DeclException0(ExcNoProlongation);
/**
* You have to call build_matrices() before using this object.
*/
DeclException0(ExcMatricesNotBuilt);
/**
* Memory used by this object.
*/
std::size_t memory_consumption () const;
/**
* Print all the matrices for debugging purposes.
*/
void print_matrices(std::ostream &os) const;
/**
* Print the copy index fields for debugging purposes.
*/
void print_indices(std::ostream &os) const;
private:
/**
* Sizes of the multi-level vectors.
*/
std::vector<types::global_dof_index> sizes;
/**
* Sparsity patterns for transfer matrices.
*/
std::vector<std_cxx1x::shared_ptr<typename internal::MatrixSelector<VECTOR>::Sparsity> > prolongation_sparsities;
/**
* The actual prolongation matrix. column indices belong to the dof
* indices of the mother cell, i.e. the coarse level. while row
* indices belong to the child cell, i.e. the fine level.
*/
std::vector<std_cxx1x::shared_ptr<typename internal::MatrixSelector<VECTOR>::Matrix> > prolongation_matrices;
/**
* Mapping for the copy_to_mg() and copy_from_mg() functions. Here only
* index pairs locally owned
*
* The data is organized as follows: one vector per level. Each
* element of these vectors contains first the global index, then
* the level index.
*/
std::vector<std::vector<std::pair<types::global_dof_index, unsigned int> > >
copy_indices;
/**
* Additional degrees of freedom for the copy_to_mg()
* function. These are the ones where the global degree of freedom
* is locally owned and the level degree of freedom is not.
*
* Organization of the data is like for #copy_indices_mine.
*/
std::vector<std::vector<std::pair<types::global_dof_index, unsigned int> > >
copy_indices_to_me;
/**
* Additional degrees of freedom for the copy_from_mg()
* function. These are the ones where the level degree of freedom
* is locally owned and the global degree of freedom is not.
*
* Organization of the data is like for #copy_indices_mine.
*/
std::vector<std::vector<std::pair<types::global_dof_index, unsigned int> > >
copy_indices_from_me;
/**
* The vector that stores what
* has been given to the
* set_component_to_block_map()
* function.
*/
std::vector<unsigned int> component_to_block_map;
/**
* Degrees of freedom on the
* refinement edge excluding
* those on the boundary.
*/
std::vector<std::vector<bool> > interface_dofs;
/**
* The constraints of the global
* system.
*/
SmartPointer<const ConstraintMatrix, MGTransferPrebuilt<VECTOR> > constraints;
/**
* The mg_constrained_dofs of the level
* systems.
*/
SmartPointer<const MGConstrainedDoFs, MGTransferPrebuilt<VECTOR> > mg_constrained_dofs;
};
/*@}*/
DEAL_II_NAMESPACE_CLOSE
#endif
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