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Make the IterativeLinearSolvers module compatible with MPL2-only mode

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by defaulting to COLAMDOrdering and NaturalOrdering for ILUT and ILLT respectively.
This commit is contained in:
Gael Guennebaud
2015-10-26 15:17:52 +01:00
parent f8b88d21a6
commit acb3c60295
3 changed files with 36 additions and 6 deletions
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21
Eigen/src/IterativeLinearSolvers/IncompleteLUT.h
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@@ -159,7 +159,7 @@ class IncompleteLUT : internal::noncopyable
template<typename Rhs, typename Dest>
void _solve(const Rhs& b, Dest& x) const
{
x = m_Pinv * b;
x = m_Pinv * b;
x = m_lu.template triangularView<UnitLower>().solve(x);
x = m_lu.template triangularView<Upper>().solve(x);
x = m_P * x;
@@ -222,16 +222,25 @@ template<typename _MatrixType>
void IncompleteLUT<Scalar>::analyzePattern(const _MatrixType& amat)
{
// Compute the Fill-reducing permutation
// Since ILUT does not perform any numerical pivoting,
// it is highly preferable to keep the diagonal through symmetric permutations.
#ifndef EIGEN_MPL2_ONLY
// To this end, let's symmetrize the pattern and perform AMD on it.
SparseMatrix<Scalar,ColMajor, Index> mat1 = amat;
SparseMatrix<Scalar,ColMajor, Index> mat2 = amat.transpose();
// Symmetrize the pattern
// FIXME for a matrix with nearly symmetric pattern, mat2+mat1 is the appropriate choice.
// on the other hand for a really non-symmetric pattern, mat2*mat1 should be prefered...
SparseMatrix<Scalar,ColMajor, Index> AtA = mat2 + mat1;
AtA.prune(keep_diag());
internal::minimum_degree_ordering<Scalar, Index>(AtA, m_P); // Then compute the AMD ordering...
m_Pinv = m_P.inverse(); // ... and the inverse permutation
AMDOrdering<Index> ordering;
ordering(AtA,m_P);
m_Pinv = m_P.inverse(); // cache the inverse permutation
#else
// If AMD is not available, (MPL2-only), then let's use the slower COLAMD routine.
SparseMatrix<Scalar,ColMajor, Index> mat1 = amat;
COLAMDOrdering<Index> ordering;
ordering(mat1,m_Pinv);
m_P = m_Pinv.inverse();
#endif
m_analysisIsOk = true;
m_factorizationIsOk = false;