/usr/include/deal.II/lac/transpose_matrix.h is in libdeal.ii-dev 8.5.1-3.
This file is owned by root:root, with mode 0o644.
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//
// Copyright (C) 2002 - 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__transpose_matrix_h
#define dealii__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 of
* 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.
*
* @deprecated If deal.II was configured with C++11 support, use the
* LinearOperator class instead, see the module on
* @ref LAOperators "linear operators"
* for further details.
*
* @ingroup Matrix2
* @author Guido Kanschat, 2006
*/
template<typename MatrixType, typename VectorType>
class
TransposeMatrix : public PointerMatrixBase<VectorType>
{
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 MatrixType *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 MatrixType *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 MatrixType *M);
/**
* Matrix-vector product.
*/
virtual void vmult (VectorType &dst,
const VectorType &src) const;
/**
* Transposed matrix-vector product.
*/
virtual void Tvmult (VectorType &dst,
const VectorType &src) const;
/**
* Matrix-vector product, adding to <tt>dst</tt>.
*/
virtual void vmult_add (VectorType &dst,
const VectorType &src) const;
/**
* Transposed matrix-vector product, adding to <tt>dst</tt>.
*/
virtual void Tvmult_add (VectorType &dst,
const VectorType &src) const;
private:
/**
* The pointer to the actual matrix.
*/
SmartPointer<const MatrixType,TransposeMatrix<MatrixType,VectorType> > m;
};
//----------------------------------------------------------------------//
template<typename MatrixType, typename VectorType>
TransposeMatrix<MatrixType, VectorType>::TransposeMatrix (const MatrixType *M)
: m(M)
{}
template<typename MatrixType, typename VectorType>
TransposeMatrix<MatrixType, VectorType>::TransposeMatrix (const char *name)
: m(0, name)
{}
template<typename MatrixType, typename VectorType>
TransposeMatrix<MatrixType, VectorType>::TransposeMatrix (const MatrixType *M,
const char *name)
: m(M, name)
{}
template<typename MatrixType, typename VectorType>
inline void
TransposeMatrix<MatrixType, VectorType>::clear ()
{
m = 0;
}
template<typename MatrixType, typename VectorType>
inline const TransposeMatrix<MatrixType, VectorType> &
TransposeMatrix<MatrixType, VectorType>::operator= (const MatrixType *M)
{
m = M;
return *this;
}
template<typename MatrixType, typename VectorType>
inline bool
TransposeMatrix<MatrixType, VectorType>::empty () const
{
if (m == 0)
return true;
return m->empty();
}
template<typename MatrixType, typename VectorType>
inline void
TransposeMatrix<MatrixType, VectorType>::vmult (VectorType &dst,
const VectorType &src) const
{
Assert (m != 0, ExcNotInitialized());
m->Tvmult (dst, src);
}
template<typename MatrixType, typename VectorType>
inline void
TransposeMatrix<MatrixType, VectorType>::Tvmult (VectorType &dst,
const VectorType &src) const
{
Assert (m != 0, ExcNotInitialized());
m->vmult (dst, src);
}
template<typename MatrixType, typename VectorType>
inline void
TransposeMatrix<MatrixType, VectorType>::vmult_add (VectorType &dst,
const VectorType &src) const
{
Assert (m != 0, ExcNotInitialized());
m->Tvmult_add (dst, src);
}
template<typename MatrixType, typename VectorType>
inline void
TransposeMatrix<MatrixType, VectorType>::Tvmult_add (VectorType &dst,
const VectorType &src) const
{
Assert (m != 0, ExcNotInitialized());
m->vmult_add (dst, src);
}
DEAL_II_NAMESPACE_CLOSE
#endif
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