1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
// 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 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_COLUMN_H
#define EIGEN_COLUMN_H
/** \class Column
*
* \brief Expression of a column
*
* \param MatrixType the type of the object in which we are taking a column
*
* This class represents an expression of a column. It is the return
* type of MatrixBase::col() and most of the time this is the only way it
* is used.
*
* However, if you want to directly maniputate column expressions,
* for instance if you want to write a function returning such an expression, you
* will need to use this class.
*
* Here is an example illustrating this:
* \include class_Column.cpp
* Output: \verbinclude class_Column.out
*
* \sa MatrixBase::col()
*/
template<typename MatrixType>
struct ei_traits<Column<MatrixType> >
{
typedef typename MatrixType::Scalar Scalar;
enum {
RowsAtCompileTime = MatrixType::RowsAtCompileTime,
ColsAtCompileTime = 1,
MaxRowsAtCompileTime = MatrixType::MaxRowsAtCompileTime,
MaxColsAtCompileTime = 1
};
};
template<typename MatrixType> class Column
: public MatrixBase<Column<MatrixType> >
{
public:
EIGEN_BASIC_PUBLIC_INTERFACE(Column)
typedef typename MatrixType::AsArg MatRef;
Column(const MatRef& matrix, int col)
: m_matrix(matrix), m_col(col)
{
assert(col >= 0 && col < matrix.cols());
}
EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Column)
private:
const Column& _asArg() const { return *this; }
int _rows() const { return m_matrix.rows(); }
int _cols() const { return 1; }
Scalar& _coeffRef(int row, int)
{
return m_matrix.coeffRef(row, m_col);
}
Scalar _coeff(int row, int) const
{
return m_matrix.coeff(row, m_col);
}
protected:
MatRef m_matrix;
const int m_col;
};
/** \returns an expression of the \a i-th column of *this. Note that the numbering starts at 0.
*
* Example: \include MatrixBase_col.cpp
* Output: \verbinclude MatrixBase_col.out
*
* \sa row(), class Column */
template<typename Derived>
Column<Derived>
MatrixBase<Derived>::col(int i)
{
return Column<Derived>(asArg(), i);
}
/** This is the const version of col(). */
template<typename Derived>
const Column<Derived>
MatrixBase<Derived>::col(int i) const
{
return Column<Derived>(asArg(), i);
}
#endif // EIGEN_COLUMN_H
|
