/usr/include/linbox/blackbox/matrix-blackbox.h is in liblinbox-dev 1.1.6~rc0-4.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* linbox/blackbox/matrix-blackbox.h
* Copyright (C) 2003 Bradford Hovinen
*
* Written by Bradford Hovinen <bghovinen@math.uwaterloo.ca>
*
* --------------------------------------------------------
*
* See COPYING for license information.
*/
#ifndef __MATRIX_BLACKBOX_H
#define __MATRIX_BLACKBOX_H
#include <linbox/blackbox/blackbox-interface.h>
#include "linbox/blackbox/archetype.h"
#include "linbox/matrix/matrix-domain.h"
#include "linbox/matrix/sparse.h"
#include "linbox/matrix/dense.h"
#include "linbox/field/rebind.h"
// Namespace in which all LinBox library code resides
namespace LinBox
{
/** \brief Matrix black box
*
\ingroup blackbox
* This class wraps a matrix meeting the @ref{MatrixArchetype} interface into a
* black box meeting the @ref{BlackboxArchetype} interface. It uses
* @ref{MatrixDomain} to implement @code{apply} and @code{applyTranspose}.
*/
template <class _Field, class _Matrix, class _Vector = typename LinBox::Vector<_Field>::Dense>
class MatrixBlackbox : public BlackboxArchetype
{
public:
typedef _Vector Vector;
typedef _Matrix Matrix;
typedef _Field Field;
typedef typename Field::Element Element;
/** Constructor.
*
* Builds a black box for the matrix given by @code{rep} over the field
* @code{F}
*
* @param F Field over which entries exist
* @param rep Matrix from which to construct the black box
*/
MatrixBlackbox (const Field &F, Matrix &rep)
: _F (F), _MD (F), _A (rep) {}
/** Constructor with size
*
* Builds a black box with the given dimensions
*
* @param F Field over which entries exist
* @param m Row dimension
* @param n Column dimension
*/
MatrixBlackbox (const Field &F, size_t m, size_t n)
: _F (F), _MD (F), _A (m, n) {}
/** Constructor
*
* Builds a black box, using the vector stream @code{stream} to fill in
* its entries
*
* @param F Field over which entries exist
* @param stream Stream with which to generate row vectors
*/
template <class Row>
MatrixBlackbox (const Field &F, VectorStream<Row> &stream)
: _F (F), _MD (F), _A (stream) {}
/** Copy constructor
*/
MatrixBlackbox (const MatrixBlackbox &B)
: _F (B._F), _MD (B._F), _A (B._A) {}
/** Destructor. */
~MatrixBlackbox () {}
template<typename _Tp1,
typename _Mat1 = typename Matrix::template rebind<_Tp1>::other,
typename _Vect1 = typename Rebind<Vector, _Tp1>::other >
struct rebind
{ typedef MatrixBlackbox<_Tp1, _Mat1, _Vect1> other; };
/** Create a clone of the matrix
*/
inline BlackboxArchetype *clone () const
{ return new MatrixBlackbox (*this); }
/** Generic matrix-vector product
* y = A x.
* @return reference to output vector y
* @param x input vector
*/
template <class Vector1, class Vector2>
inline Vector1 &apply (Vector1 &y, const Vector2 &x) const
{ return _MD.vectorMul (y, _A, x); }
/** Matrix-vector product
* y = A x.
* @return reference to output vector y
* @param x input vector
*/
inline Vector &apply (Vector &y, const Vector &x) const
{ return apply<Vector, Vector> (y, x); }
/** Generic transpose matrix-vector product
* y = A^T x.
* @return reference to output vector y
* @param x input vector
*/
template <class Vector1, class Vector2>
inline Vector1 &applyTranspose (Vector1 &y, const Vector2 &x) const
{ return _MD.vectorMul (y, TransposeMatrix<const Matrix> (_A), x); }
/** Transpose matrix-vector product
* y = A^T x.
* @return reference to output vector y
* @param x input vector
*/
inline Vector &applyTranspose (Vector &y, const Vector &x) const
{ return applyTranspose<Vector, Vector> (y, x); }
/** Retreive row dimensions of Sparsemat matrix.
* @return integer number of rows of SparseMatrix0Base matrix.
*/
inline size_t rowdim () const
{ return _A.rowdim (); }
/** Retreive column dimensions of Sparsemat matrix.
* @return integer number of columns of SparseMatrix0Base matrix.
*/
inline size_t coldim () const
{ return _A.coldim (); }
/** Read the matrix from a stream
* @param is Input stream from which to read the matrix
* @return Reference to input stream
*/
inline std::istream &read (std::istream &is)
{ return _MD.read (is, _A); }
/** Write the matrix to a stream
* @param os Output stream to which to write the matrix
* @return Reference to output stream
*/
inline std::ostream &write (std::ostream &os) const
{ return _MD.write (os, _A); }
/** Return a reference to the base field
*/
inline const Field &field () const { return _F;}
/** Return a reference to the underlying representation
*/
inline Matrix &rep () { return _A; }
private:
const Field &_F; // Field used for all arithmetic
MatrixDomain<Field> _MD; // Matrix domain for matrix-vector
// operations
Matrix _A; // Underlying matrix representation
};
} // namespace LinBox
#endif // __MATRIX_BLACKBOX_H
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