mirror of
https://gitlab.com/libeigen/eigen.git
synced 2024-12-15 07:10:37 +08:00
113 lines
3.8 KiB
C++
113 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) 2006-2007 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_MINOR_H
|
|
#define EIGEN_MINOR_H
|
|
|
|
/** \class Minor
|
|
*
|
|
* \brief Expression of a minor
|
|
*
|
|
* \param MatrixType the type of the object in which we are taking a minor
|
|
*
|
|
* This class represents an expression of a minor. It is the return
|
|
* type of MatrixBase::minor() and most of the time this is the only way it
|
|
* is used.
|
|
*
|
|
* \sa MatrixBase::minor()
|
|
*/
|
|
template<typename MatrixType> class Minor
|
|
: public MatrixBase<typename MatrixType::Scalar, Minor<MatrixType> >
|
|
{
|
|
public:
|
|
typedef typename MatrixType::Scalar Scalar;
|
|
typedef typename MatrixType::Ref MatRef;
|
|
friend class MatrixBase<Scalar, Minor<MatrixType> >;
|
|
|
|
Minor(const MatRef& matrix,
|
|
int row, int col)
|
|
: m_matrix(matrix), m_row(row), m_col(col)
|
|
{
|
|
assert(row >= 0 && row < matrix.rows()
|
|
&& col >= 0 && col < matrix.cols());
|
|
}
|
|
|
|
Minor(const Minor& other)
|
|
: m_matrix(other.m_matrix), m_row(other.m_row), m_col(other.m_col) {}
|
|
|
|
EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Minor)
|
|
|
|
private:
|
|
static const int
|
|
_RowsAtCompileTime = (MatrixType::RowsAtCompileTime != Dynamic) ?
|
|
MatrixType::RowsAtCompileTime - 1 : Dynamic,
|
|
_ColsAtCompileTime = (MatrixType::ColsAtCompileTime != Dynamic) ?
|
|
MatrixType::ColsAtCompileTime - 1 : Dynamic;
|
|
|
|
const Minor& _ref() const { return *this; }
|
|
int _rows() const { return m_matrix.rows() - 1; }
|
|
int _cols() const { return m_matrix.cols() - 1; }
|
|
|
|
Scalar& _coeffRef(int row, int col)
|
|
{
|
|
return m_matrix.coeffRef(row + (row >= m_row), col + (col >= m_col));
|
|
}
|
|
|
|
Scalar _coeff(int row, int col) const
|
|
{
|
|
return m_matrix.coeff(row + (row >= m_row), col + (col >= m_col));
|
|
}
|
|
|
|
protected:
|
|
MatRef m_matrix;
|
|
const int m_row, m_col;
|
|
};
|
|
|
|
/** \return an expression of the (\a row, \a col)-minor of *this,
|
|
* i.e. an expression constructed from *this by removing the specified
|
|
* row and column.
|
|
*
|
|
* Example: \include MatrixBase_minor.cpp
|
|
* Output: \verbinclude MatrixBase_minor.out
|
|
*
|
|
* \sa class Minor
|
|
*/
|
|
template<typename Scalar, typename Derived>
|
|
Minor<Derived>
|
|
MatrixBase<Scalar, Derived>::minor(int row, int col)
|
|
{
|
|
return Minor<Derived>(ref(), row, col);
|
|
}
|
|
|
|
/** This is the const version of minor(). */
|
|
template<typename Scalar, typename Derived>
|
|
const Minor<Derived>
|
|
MatrixBase<Scalar, Derived>::minor(int row, int col) const
|
|
{
|
|
return Minor<Derived>(ref(), row, col);
|
|
}
|
|
|
|
#endif // EIGEN_MINOR_H
|