diff options
Diffstat (limited to 'Eigen/src/LU/FullPivLU.h')
| -rw-r--r-- | Eigen/src/LU/FullPivLU.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/Eigen/src/LU/FullPivLU.h b/Eigen/src/LU/FullPivLU.h index 1721213d6..64b9eb7f1 100644 --- a/Eigen/src/LU/FullPivLU.h +++ b/Eigen/src/LU/FullPivLU.h @@ -231,6 +231,15 @@ template<typename _MatrixType> class FullPivLU return Solve<FullPivLU, Rhs>(*this, b.derived()); } + /** \returns an estimate of the reciprocal condition number of the matrix of which \c *this is + the LU decomposition. + */ + inline RealScalar rcond() const + { + eigen_assert(m_isInitialized && "PartialPivLU is not initialized."); + return internal::rcond_estimate_helper(m_l1_norm, *this); + } + /** \returns the determinant of the matrix of which * *this is the LU decomposition. It has only linear complexity * (that is, O(n) where n is the dimension of the square matrix) @@ -410,6 +419,7 @@ template<typename _MatrixType> class FullPivLU IntColVectorType m_rowsTranspositions; IntRowVectorType m_colsTranspositions; Index m_det_pq, m_nonzero_pivots; + RealScalar m_l1_norm; RealScalar m_maxpivot, m_prescribedThreshold; bool m_isInitialized, m_usePrescribedThreshold; }; @@ -455,11 +465,12 @@ FullPivLU<MatrixType>& FullPivLU<MatrixType>::compute(const EigenBase<InputType> // the permutations are stored as int indices, so just to be sure: eigen_assert(matrix.rows()<=NumTraits<int>::highest() && matrix.cols()<=NumTraits<int>::highest()); - m_isInitialized = true; m_lu = matrix.derived(); + m_l1_norm = m_lu.cwiseAbs().colwise().sum().maxCoeff(); computeInPlace(); + m_isInitialized = true; return *this; } |