/usr/include/deal.II/lac/block_matrix.h is in libdeal.ii-dev 8.1.0-4.
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// $Id: block_matrix.h 30036 2013-07-18 16:55:32Z maier $
//
// Copyright (C) 2000 - 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__block_matrix_h
#define __deal2__block_matrix_h
#include <deal.II/base/config.h>
#include <deal.II/base/exceptions.h>
#include <deal.II/base/smartpointer.h>
#include <deal.II/lac/block_vector.h>
DEAL_II_NAMESPACE_OPEN
/*! @addtogroup Matrix2
*@{
*/
/**
* A matrix with several copies of the same block on the diagonal.
*
* This matrix implements an @p m by @p m block matrix. Each
* diagonal block consists of the same (non-block) matrix, while
* off-diagonal blocks are void.
*
* One special application is a one by one block matrix, allowing to
* apply the @p vmult of the original matrix (or preconditioner) to a
* block vector.
*
* @see @ref GlossBlockLA "Block (linear algebra)"
* @author Guido Kanschat, 2000
*/
template <class MATRIX>
class BlockDiagonalMatrix : public Subscriptor
{
public:
/**
* Constructor for an @p n_blocks
* by @p n_blocks matrix with
* diagonal blocks @p M.
*/
BlockDiagonalMatrix (const MATRIX &M,
const unsigned int n_blocks);
/**
* Matrix-vector-multiplication.
*/
template <typename number1, typename number2>
void vmult (BlockVector<number1> &dst,
const BlockVector<number2> &src) const;
/**
* Transposed matrix-vector-multiplication.
*/
template <typename number1, typename number2>
void Tvmult (BlockVector<number1> &dst,
const BlockVector<number2> &src) const;
private:
/**
* Number of blocks.
*/
unsigned int num_blocks;
/**
* Diagonal entry.
*/
SmartPointer<const MATRIX,BlockDiagonalMatrix<MATRIX> > matrix;
};
/*@}*/
//---------------------------------------------------------------------------
template <class MATRIX>
BlockDiagonalMatrix<MATRIX>::BlockDiagonalMatrix (const MATRIX &M,
const unsigned int num_blocks)
:
num_blocks (num_blocks),
matrix(&M)
{}
template <class MATRIX>
template <typename number1, typename number2>
void
BlockDiagonalMatrix<MATRIX>::vmult (BlockVector<number1> &dst,
const BlockVector<number2> &src) const
{
Assert (dst.n_blocks()==num_blocks,
ExcDimensionMismatch(dst.n_blocks(),num_blocks));
Assert (src.n_blocks()==num_blocks,
ExcDimensionMismatch(src.n_blocks(),num_blocks));
for (unsigned int i=0; i<num_blocks; ++i)
matrix->vmult (dst.block(i), src.block(i));
}
template <class MATRIX>
template <typename number1, typename number2>
void
BlockDiagonalMatrix<MATRIX>::Tvmult (BlockVector<number1> &dst,
const BlockVector<number2> &src) const
{
Assert (dst.n_blocks()==num_blocks,
ExcDimensionMismatch(dst.n_blocks(),num_blocks));
Assert (src.n_blocks()==num_blocks,
ExcDimensionMismatch(src.n_blocks(),num_blocks));
for (unsigned int i=0; i<num_blocks; ++i)
matrix->Tvmult (dst.block(i), src.block(i));
}
DEAL_II_NAMESPACE_CLOSE
#endif
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