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Add matrixR() to get the triangular factor from the Householder QR

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Desire NUENTSA 2013-02-20 13:58:26 +01:00
parent 962c99d462
commit bc18e06fe3
1 changed files with 29 additions and 2 deletions
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29
Eigen/src/QR/ColPivHouseholderQR.h
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@ -146,6 +146,20 @@ template<typename _MatrixType> class ColPivHouseholderQR
return m_qr;
}
/** \returns a reference to the matrix where the Householder QR is stored
* To get the triangular factor R, use
* \code matrixR().template triangularView<Upper>() \endcode
* For rank-deficient matrices, use
* \code
* matrixR().topLeftCorner(rank(), rank()).template triangularView<Upper>()
* \endcode
*/
const MatrixType& matrixR() const
{
eigen_assert(m_isInitialized && "ColPivHouseholderQR is not initialized.");
return m_qr;
}
ColPivHouseholderQR& compute(const MatrixType& matrix);
const PermutationType& colsPermutation() const
@ -337,6 +351,18 @@ template<typename _MatrixType> class ColPivHouseholderQR
*/
RealScalar maxPivot() const { return m_maxpivot; }
/** \brief Reports whether the QR factorization was succesful.
*
* \note This routine is provided for uniformity with other factorization modules
* \returns \c Success if computation was succesful,
* \c NumericalIssue if the QR can not be computed
*/
ComputationInfo info() const
{
eigen_assert(m_isInitialized && "Decomposition is not initialized.");
return Success;
}
protected:
MatrixType m_qr;
HCoeffsType m_hCoeffs;
@ -345,6 +371,7 @@ template<typename _MatrixType> class ColPivHouseholderQR
RowVectorType m_temp;
RealRowVectorType m_colSqNorms;
bool m_isInitialized, m_usePrescribedThreshold;
mutable ComputationInfo m_info;
RealScalar m_prescribedThreshold, m_maxpivot;
Index m_nonzero_pivots;
Index m_det_pq;
@ -488,7 +515,7 @@ struct solve_retval<ColPivHouseholderQR<_MatrixType>, Rhs>
.transpose()
);
dec().matrixQR()
dec().matrixR()
.topLeftCorner(nonzero_pivots, nonzero_pivots)
.template triangularView<Upper>()
.solveInPlace(c.topRows(nonzero_pivots));