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117 lines
3.5 KiB
117 lines
3.5 KiB
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2006-2009 Benoit Jacob <jacob.benoit.1@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef EIGEN_MINOR_H
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#define EIGEN_MINOR_H
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namespace Eigen {
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/**
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* \class Minor
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*
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* \brief Expression of a minor
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*
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* \param MatrixType the type of the object in which we are taking a minor
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*
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* This class represents an expression of a minor. It is the return
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* type of MatrixBase::minor() and most of the time this is the only way it
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* is used.
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*
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* \sa MatrixBase::minor()
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*/
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namespace internal {
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template<typename MatrixType>
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struct traits<Minor<MatrixType> >
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: traits<MatrixType>
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{
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typedef typename nested<MatrixType>::type MatrixTypeNested;
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typedef typename remove_reference<MatrixTypeNested>::type _MatrixTypeNested;
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typedef typename MatrixType::StorageKind StorageKind;
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enum {
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RowsAtCompileTime = (MatrixType::RowsAtCompileTime != Dynamic) ?
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int(MatrixType::RowsAtCompileTime) - 1 : Dynamic,
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ColsAtCompileTime = (MatrixType::ColsAtCompileTime != Dynamic) ?
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int(MatrixType::ColsAtCompileTime) - 1 : Dynamic,
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MaxRowsAtCompileTime = (MatrixType::MaxRowsAtCompileTime != Dynamic) ?
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int(MatrixType::MaxRowsAtCompileTime) - 1 : Dynamic,
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MaxColsAtCompileTime = (MatrixType::MaxColsAtCompileTime != Dynamic) ?
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int(MatrixType::MaxColsAtCompileTime) - 1 : Dynamic,
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Flags = _MatrixTypeNested::Flags & (HereditaryBits | LvalueBit),
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CoeffReadCost = _MatrixTypeNested::CoeffReadCost // minor is used typically on tiny matrices,
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// where loops are unrolled and the 'if' evaluates at compile time
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};
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};
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}
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template<typename MatrixType> class Minor
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: public MatrixBase<Minor<MatrixType> >
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{
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public:
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typedef MatrixBase<Minor> Base;
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EIGEN_DENSE_PUBLIC_INTERFACE(Minor)
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inline Minor(const MatrixType& matrix,
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Index row, Index col)
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: m_matrix(matrix), m_row(row), m_col(col)
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{
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eigen_assert(row >= 0 && row < matrix.rows()
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&& col >= 0 && col < matrix.cols());
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}
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EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Minor)
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inline Index rows() const { return m_matrix.rows() - 1; }
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inline Index cols() const { return m_matrix.cols() - 1; }
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inline Scalar& coeffRef(Index row, Index col)
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{
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return m_matrix.const_cast_derived().coeffRef(row + (row >= m_row), col + (col >= m_col));
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}
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inline const Scalar coeff(Index row, Index col) const
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{
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return m_matrix.coeff(row + (row >= m_row), col + (col >= m_col));
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}
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protected:
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const typename MatrixType::Nested m_matrix;
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const Index m_row, m_col;
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};
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/**
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* \return an expression of the (\a row, \a col)-minor of *this,
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* i.e. an expression constructed from *this by removing the specified
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* row and column.
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*
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* Example: \include MatrixBase_minor.cpp
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* Output: \verbinclude MatrixBase_minor.out
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*
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* \sa class Minor
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*/
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template<typename Derived>
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inline Minor<Derived>
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MatrixBase<Derived>::minor(Index row, Index col)
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{
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return Minor<Derived>(derived(), row, col);
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}
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/**
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* This is the const version of minor(). */
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template<typename Derived>
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inline const Minor<Derived>
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MatrixBase<Derived>::minor(Index row, Index col) const
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{
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return Minor<Derived>(derived(), row, col);
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}
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} // end namespace Eigen
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#endif // EIGEN_MINOR_H
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