/usr/include/libmesh/coupling_matrix.h is in libmesh-dev 0.7.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
// This library is free software; you can 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.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef __coupling_matrix_h__
#define __coupling_matrix_h__
// C++ includes
#include <vector>
// Local Includes
#include "libmesh_common.h"
namespace libMesh
{
/**
* This class defines a coupling matrix. A coupling
* matrix is simply a matrix of ones and zeros describing
* how different components in a system couple with each
* other. A coupling matrix is necessarily square but not
* necessarily symmetric.
*/
class CouplingMatrix
{
public:
/**
* Constructor.
*/
CouplingMatrix (const unsigned int n=0);
/**
* @returns the (i,j) entry of the matrix.
*/
unsigned char operator() (const unsigned int i,
const unsigned int j) const;
/**
* @returns the (i,j) entry of the matrix as
* a writeable reference.
*/
unsigned char & operator() (const unsigned int i,
const unsigned int j);
/**
* @returns the size of the matrix, i.e. N for an
* NxN matrix.
*/
unsigned int size() const;
/**
* Resizes the matrix and initializes
* all entries to be 0.
*/
void resize(const unsigned int n);
/**
* Clears the matrix.
*/
void clear();
/**
* @returns true if the matrix is empty.
*/
bool empty() const;
private:
/**
* The actual matrix values. These
* are stored as unsigned chars because
* a vector of bools is not what you
* think.
*/
std::vector<unsigned char> _values;
/**
* The size of the matrix.
*/
unsigned int _size;
};
//--------------------------------------------------
// CouplingMatrix inline methods
inline
CouplingMatrix::CouplingMatrix (const unsigned int n) :
_values(), _size(n)
{
this->resize(n);
}
inline
unsigned char CouplingMatrix::operator() (const unsigned int i,
const unsigned int j) const
{
libmesh_assert (i < _size);
libmesh_assert (j < _size);
return _values[i*_size + j];
}
inline
unsigned char & CouplingMatrix::operator() (const unsigned int i,
const unsigned int j)
{
libmesh_assert (i < _size);
libmesh_assert (j < _size);
return _values[i*_size + j];
}
inline
unsigned int CouplingMatrix::size() const
{
return _size;
}
inline
void CouplingMatrix::resize(const unsigned int n)
{
_size = n;
_values.resize(_size*_size);
for (unsigned int i=0; i<_values.size(); i++)
_values[i] = 0;
}
inline
void CouplingMatrix::clear()
{
_size = 0;
_values.clear();
}
inline
bool CouplingMatrix::empty() const
{
return (_size == 0);
}
} // namespace libMesh
#endif
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