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Fix sign of SuperLU::determinant

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This commit is contained in:
Gael Guennebaud 2015-03-31 14:57:32 +02:00
parent 35d3053d55
commit bd76d837e6
1 changed files with 6 additions and 2 deletions
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8
Eigen/src/SuperLUSupport/SuperLUSupport.h
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@ -302,6 +302,7 @@ class SuperLUBase : public SparseSolverBase<Derived>
typedef Matrix<Scalar,Dynamic,1> Vector;
typedef Matrix<int, 1, MatrixType::ColsAtCompileTime> IntRowVectorType;
typedef Matrix<int, MatrixType::RowsAtCompileTime, 1> IntColVectorType;
typedef Map<PermutationMatrix<Dynamic,Dynamic,int> > PermutationMap;
typedef SparseMatrix<Scalar> LUMatrixType;
public:
@ -459,10 +460,11 @@ class SuperLU : public SuperLUBase<_MatrixType,SuperLU<_MatrixType> >
typedef typename Base::RealScalar RealScalar;
typedef typename Base::StorageIndex StorageIndex;
typedef typename Base::IntRowVectorType IntRowVectorType;
typedef typename Base::IntColVectorType IntColVectorType;
typedef typename Base::IntColVectorType IntColVectorType;
typedef typename Base::PermutationMap PermutationMap;
typedef typename Base::LUMatrixType LUMatrixType;
typedef TriangularView<LUMatrixType, Lower|UnitDiag> LMatrixType;
typedef TriangularView<LUMatrixType, Upper> UMatrixType;
typedef TriangularView<LUMatrixType, Upper> UMatrixType;
public:
using Base::_solve_impl;
@ -774,6 +776,8 @@ typename SuperLU<MatrixType>::Scalar SuperLU<MatrixType>::determinant() const
det *= m_u.valuePtr()[lastId];
}
}
if(PermutationMap(m_p.data(),m_p.size()).determinant()*PermutationMap(m_q.data(),m_q.size()).determinant()<0)
det = -det;
if(m_sluEqued!='N')
return det/m_sluRscale.prod()/m_sluCscale.prod();
else