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Fix SparseLU::absDeterminant and add respective unit test

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(grafted from a370b1f2e2
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This commit is contained in:
Gael Guennebaud
2014-10-17 16:52:56 +02:00
parent 8ea2ab4829
commit 4126cb6369
4 changed files with 40 additions and 5 deletions
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5
Eigen/src/SparseLU/SparseLU.h
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@@ -260,14 +260,13 @@ class SparseLU : public internal::SparseLUImpl<typename _MatrixType::Scalar, typ
eigen_assert(m_factorizationIsOk && "The matrix should be factorized first.");
// Initialize with the determinant of the row matrix
Scalar det = Scalar(1.);
//Note that the diagonal blocks of U are stored in supernodes,
// Note that the diagonal blocks of U are stored in supernodes,
// which are available in the L part :)
for (Index j = 0; j < this->cols(); ++j)
{
for (typename SCMatrix::InnerIterator it(m_Lstore, j); it; ++it)
{
if(it.row() < j) continue;
if(it.row() == j)
if(it.index() == j)
{
det *= (std::abs)(it.value());
break;