/usr/include/deal.II/lac/transpose_matrix.h is in libdeal.ii-dev 8.1.0-4.
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// $Id: transpose_matrix.h 30036 2013-07-18 16:55:32Z maier $
//
// Copyright (C) 2002 - 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__transpose_matrix_h
#define __deal2__transpose_matrix_h
#include <deal.II/base/subscriptor.h>
#include <deal.II/lac/pointer_matrix.h>
DEAL_II_NAMESPACE_OPEN
/**
* The transpose of a given matrix. This auxiliary class swaps the
* effect ov vmult() and Tvmult() as well as vmult_add() and
* Tvmult_add().
*
* The implementation is analogous to the class PointerMatrix.
*
* @note The transposed matrix is never actually assembled. Instead,
* only the matrix vector multiplication is performed in a transposed
* way.
*
* @ingroup Matrix2
* @author Guido Kanschat, 2006
*/
template<class MATRIX, class VECTOR>
class
TransposeMatrix : public PointerMatrixBase<VECTOR>
{
public:
/**
* Constructor. The pointer in the
* argument is stored in this
* class. As usual, the lifetime of
* <tt>*M</tt> must be longer than the
* one of the PointerMatrix.
*
* If <tt>M</tt> is zero, no
* matrix is stored.
*/
TransposeMatrix (const MATRIX *M=0);
/**
* Constructor. The name argument
* is used to identify the
* SmartPointer for this object.
*/
TransposeMatrix(const char *name);
/**
* Constructor. <tt>M</tt> points
* to a matrix which must live
* longer than the
* TransposeMatrix. The name
* argument is used to identify
* the SmartPointer for this
* object.
*/
TransposeMatrix(const MATRIX *M,
const char *name);
// Use doc from base class
virtual void clear();
/**
* Return whether the object is
* empty.
*/
bool empty () const;
/**
* Assign a new matrix
* pointer. Deletes the old pointer
* and releases its matrix.
* @see SmartPointer
*/
const TransposeMatrix &operator= (const MATRIX *M);
/**
* Matrix-vector product.
*/
virtual void vmult (VECTOR &dst,
const VECTOR &src) const;
/**
* Tranposed matrix-vector product.
*/
virtual void Tvmult (VECTOR &dst,
const VECTOR &src) const;
/**
* Matrix-vector product, adding to
* <tt>dst</tt>.
*/
virtual void vmult_add (VECTOR &dst,
const VECTOR &src) const;
/**
* Tranposed matrix-vector product,
* adding to <tt>dst</tt>.
*/
virtual void Tvmult_add (VECTOR &dst,
const VECTOR &src) const;
private:
/**
* Return the address of the
* matrix for comparison.
*/
virtual const void *get() const;
/**
* The pointer to the actual matrix.
*/
SmartPointer<const MATRIX,TransposeMatrix<MATRIX,VECTOR> > m;
};
//----------------------------------------------------------------------//
template<class MATRIX, class VECTOR>
TransposeMatrix<MATRIX, VECTOR>::TransposeMatrix (const MATRIX *M)
: m(M)
{}
template<class MATRIX, class VECTOR>
TransposeMatrix<MATRIX, VECTOR>::TransposeMatrix (const char *name)
: m(0, name)
{}
template<class MATRIX, class VECTOR>
TransposeMatrix<MATRIX, VECTOR>::TransposeMatrix (
const MATRIX *M,
const char *name)
: m(M, name)
{}
template<class MATRIX, class VECTOR>
inline void
TransposeMatrix<MATRIX, VECTOR>::clear ()
{
m = 0;
}
template<class MATRIX, class VECTOR>
inline const TransposeMatrix<MATRIX, VECTOR> &
TransposeMatrix<MATRIX, VECTOR>::operator= (const MATRIX *M)
{
m = M;
return *this;
}
template<class MATRIX, class VECTOR>
inline bool
TransposeMatrix<MATRIX, VECTOR>::empty () const
{
if (m == 0)
return true;
return m->empty();
}
template<class MATRIX, class VECTOR>
inline void
TransposeMatrix<MATRIX, VECTOR>::vmult (VECTOR &dst,
const VECTOR &src) const
{
Assert (m != 0, ExcNotInitialized());
m->Tvmult (dst, src);
}
template<class MATRIX, class VECTOR>
inline void
TransposeMatrix<MATRIX, VECTOR>::Tvmult (VECTOR &dst,
const VECTOR &src) const
{
Assert (m != 0, ExcNotInitialized());
m->vmult (dst, src);
}
template<class MATRIX, class VECTOR>
inline void
TransposeMatrix<MATRIX, VECTOR>::vmult_add (VECTOR &dst,
const VECTOR &src) const
{
Assert (m != 0, ExcNotInitialized());
m->Tvmult_add (dst, src);
}
template<class MATRIX, class VECTOR>
inline void
TransposeMatrix<MATRIX, VECTOR>::Tvmult_add (VECTOR &dst,
const VECTOR &src) const
{
Assert (m != 0, ExcNotInitialized());
m->vmult_add (dst, src);
}
template<class MATRIX, class VECTOR>
inline const void *
TransposeMatrix<MATRIX, VECTOR>::get () const
{
return m;
}
DEAL_II_NAMESPACE_CLOSE
#endif
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