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Optimize Simplicial Cholesky when NaturalOrdering is used.

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This commit is contained in:
Gael Guennebaud 2014-12-08 15:02:25 +01:00
parent 30c849669d
commit 7f7a712062
1 changed files with 24 additions and 11 deletions
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35
Eigen/src/SparseCholesky/SimplicialCholesky.h
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@ -607,22 +607,35 @@ void SimplicialCholeskyBase<Derived>::ordering(const MatrixType& a, CholMatrixTy
{
eigen_assert(a.rows()==a.cols());
const Index size = a.rows();
// Note that amd compute the inverse permutation
// Note that ordering methods compute the inverse permutation
if(!internal::is_same<OrderingType,NaturalOrdering<Index> >::value)
{
CholMatrixType C;
C = a.template selfadjointView<UpLo>();
{
CholMatrixType C;
C = a.template selfadjointView<UpLo>();
OrderingType ordering;
ordering(C,m_Pinv);
}
if(m_Pinv.size()>0) m_P = m_Pinv.inverse();
else m_P.resize(0);
OrderingType ordering;
ordering(C,m_Pinv);
ap.resize(size,size);
ap.template selfadjointView<Upper>() = a.template selfadjointView<UpLo>().twistedBy(m_P);
}
if(m_Pinv.size()>0)
m_P = m_Pinv.inverse();
else
{
m_Pinv.resize(0);
m_P.resize(0);
ap.resize(size,size);
ap.template selfadjointView<Upper>() = a.template selfadjointView<UpLo>().twistedBy(m_P);
if(UpLo==Lower)
{
ap.resize(size,size);
ap.template selfadjointView<Upper>() = a.template selfadjointView<UpLo>().twistedBy(m_P);
}
else
ap = a.template triangularView<Upper>();
}
}
} // end namespace Eigen