mirror of
https://gitlab.com/libeigen/eigen.git
synced 2026-04-10 11:34:33 +08:00
c67e717404
- finally get the Eval stuff right. get back to having Eval as a subclass of Matrix with limited functionality, and then, add a typedef MatrixType to get the actual matrix type. - add swap(), findBiggestCoeff() - bugfix by Ramon in Transpose - new demo: doc/echelon.cpp
106 lines
3.8 KiB
C++
106 lines
3.8 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
|
|
// for linear algebra. Eigen itself is part of the KDE project.
|
|
//
|
|
// Copyright (C) 2006-2008 Benoit Jacob <jacob@math.jussieu.fr>
|
|
//
|
|
// Eigen is free software; you can redistribute it and/or modify it under the
|
|
// terms of the GNU General Public License as published by the Free Software
|
|
// Foundation; either version 2 or (at your option) any later version.
|
|
//
|
|
// Eigen 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 General Public License for more
|
|
// details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License along
|
|
// with Eigen; if not, write to the Free Software Foundation, Inc., 51
|
|
// Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
//
|
|
// As a special exception, if other files instantiate templates or use macros
|
|
// or functions from this file, or you compile this file and link it
|
|
// with other works to produce a work based on this file, this file does not
|
|
// by itself cause the resulting work to be covered by the GNU General Public
|
|
// License. This exception does not invalidate any other reasons why a work
|
|
// based on this file might be covered by the GNU General Public License.
|
|
|
|
#ifndef EIGEN_DIAGONALCOEFFS_H
|
|
#define EIGEN_DIAGONALCOEFFS_H
|
|
|
|
/** \class DiagonalCoeffs
|
|
*
|
|
* \brief Expression of the main diagonal of a square matrix
|
|
*
|
|
* \param MatrixType the type of the object in which we are taking the main diagonal
|
|
*
|
|
* This class represents an expression of the main diagonal of a square matrix.
|
|
* It is the return type of MatrixBase::diagonal() and most of the time this is
|
|
* the only way it is used.
|
|
*
|
|
* \sa MatrixBase::diagonal()
|
|
*/
|
|
template<typename MatrixType> class DiagonalCoeffs
|
|
: public MatrixBase<typename MatrixType::Scalar, DiagonalCoeffs<MatrixType> >
|
|
{
|
|
public:
|
|
typedef typename MatrixType::Scalar Scalar;
|
|
typedef typename MatrixType::Ref MatRef;
|
|
friend class MatrixBase<Scalar, DiagonalCoeffs>;
|
|
typedef MatrixBase<Scalar, DiagonalCoeffs> Base;
|
|
|
|
DiagonalCoeffs(const MatRef& matrix) : m_matrix(matrix) {}
|
|
|
|
EIGEN_INHERIT_ASSIGNMENT_OPERATORS(DiagonalCoeffs)
|
|
|
|
private:
|
|
enum {
|
|
RowsAtCompileTime = MatrixType::Traits::SizeAtCompileTime == Dynamic ? Dynamic
|
|
: EIGEN_ENUM_MIN(MatrixType::Traits::RowsAtCompileTime,
|
|
MatrixType::Traits::ColsAtCompileTime),
|
|
ColsAtCompileTime = 1,
|
|
MaxRowsAtCompileTime = MatrixType::Traits::MaxSizeAtCompileTime == Dynamic ? Dynamic
|
|
: EIGEN_ENUM_MIN(MatrixType::Traits::MaxRowsAtCompileTime,
|
|
MatrixType::Traits::MaxColsAtCompileTime),
|
|
MaxColsAtCompileTime = 1
|
|
};
|
|
|
|
const DiagonalCoeffs& _ref() const { return *this; }
|
|
int _rows() const { return std::min(m_matrix.rows(), m_matrix.cols()); }
|
|
int _cols() const { return 1; }
|
|
|
|
Scalar& _coeffRef(int row, int)
|
|
{
|
|
return m_matrix.coeffRef(row, row);
|
|
}
|
|
|
|
Scalar _coeff(int row, int) const
|
|
{
|
|
return m_matrix.coeff(row, row);
|
|
}
|
|
|
|
protected:
|
|
MatRef m_matrix;
|
|
};
|
|
|
|
/** \returns an expression of the main diagonal of *this, which must be a square matrix.
|
|
*
|
|
* Example: \include MatrixBase_diagonal.cpp
|
|
* Output: \verbinclude MatrixBase_diagonal.out
|
|
*
|
|
* \sa class DiagonalCoeffs */
|
|
template<typename Scalar, typename Derived>
|
|
DiagonalCoeffs<Derived>
|
|
MatrixBase<Scalar, Derived>::diagonal()
|
|
{
|
|
return DiagonalCoeffs<Derived>(ref());
|
|
}
|
|
|
|
/** This is the const version of diagonal(). */
|
|
template<typename Scalar, typename Derived>
|
|
const DiagonalCoeffs<Derived>
|
|
MatrixBase<Scalar, Derived>::diagonal() const
|
|
{
|
|
return DiagonalCoeffs<Derived>(ref());
|
|
}
|
|
|
|
#endif // EIGEN_DIAGONALCOEFFS_H
|