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// 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.benoit.1@gmail.com>
//
// Eigen 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 3 of the License, or (at your option) any later version.
//
// Alternatively, 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 of
// the License, 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 Lesser General Public License or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.
#ifndef EIGEN_DIAGONALCOEFFS_H
#define EIGEN_DIAGONALCOEFFS_H
/** \class DiagonalCoeffs
*
* \brief Expression of the main diagonal of a matrix
*
* \param MatrixType the type of the object in which we are taking the main diagonal
*
* The matrix is not required to be square.
*
* 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>
struct ei_traits<DiagonalCoeffs<MatrixType> >
{
typedef typename MatrixType::Scalar Scalar;
typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
enum {
RowsAtCompileTime = int(MatrixType::SizeAtCompileTime) == Dynamic ? Dynamic
: EIGEN_ENUM_MIN(MatrixType::RowsAtCompileTime,
MatrixType::ColsAtCompileTime),
ColsAtCompileTime = 1,
MaxRowsAtCompileTime = int(MatrixType::MaxSizeAtCompileTime) == Dynamic ? Dynamic
: EIGEN_ENUM_MIN(MatrixType::MaxRowsAtCompileTime,
MatrixType::MaxColsAtCompileTime),
MaxColsAtCompileTime = 1,
Flags = (unsigned int)_MatrixTypeNested::Flags & (HereditaryBits | LinearAccessBit),
CoeffReadCost = _MatrixTypeNested::CoeffReadCost
};
};
template<typename MatrixType> class DiagonalCoeffs
: public MatrixBase<DiagonalCoeffs<MatrixType> >
{
public:
EIGEN_GENERIC_PUBLIC_INTERFACE(DiagonalCoeffs)
inline DiagonalCoeffs(const MatrixType& matrix) : m_matrix(matrix) {}
EIGEN_INHERIT_ASSIGNMENT_OPERATORS(DiagonalCoeffs)
inline int rows() const { return std::min(m_matrix.rows(), m_matrix.cols()); }
inline int cols() const { return 1; }
inline Scalar& coeffRef(int row, int)
{
return m_matrix.const_cast_derived().coeffRef(row, row);
}
inline const Scalar coeff(int row, int) const
{
return m_matrix.coeff(row, row);
}
inline Scalar& coeffRef(int index)
{
return m_matrix.const_cast_derived().coeffRef(index, index);
}
inline const Scalar coeff(int index) const
{
return m_matrix.coeff(index, index);
}
protected:
const typename MatrixType::Nested m_matrix;
};
/** \returns an expression of the main diagonal of the matrix \c *this
*
* \c *this is not required to be square.
*
* Example: \include MatrixBase_diagonal.cpp
* Output: \verbinclude MatrixBase_diagonal.out
*
* \sa class DiagonalCoeffs */
template<typename Derived>
inline DiagonalCoeffs<Derived>
MatrixBase<Derived>::diagonal()
{
return DiagonalCoeffs<Derived>(derived());
}
/** This is the const version of diagonal(). */
template<typename Derived>
inline const DiagonalCoeffs<Derived>
MatrixBase<Derived>::diagonal() const
{
return DiagonalCoeffs<Derived>(derived());
}
#endif // EIGEN_DIAGONALCOEFFS_H
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