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fix overflow in sparse product

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This commit is contained in:
Gael Guennebaud 2009-01-28 18:21:38 +00:00
parent 9bc44094c5
commit 9b594ab0fb
1 changed files with 3 additions and 3 deletions
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6
Eigen/src/Sparse/SparseProduct.h
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@ -105,7 +105,7 @@ struct ei_traits<SparseProduct<LhsNested, RhsNested, ProductMode> >
CoeffReadCost = Dynamic
};
typedef typename ei_meta_if<ResultIsSparse,
SparseMatrixBase<SparseProduct<LhsNested, RhsNested, ProductMode> >,
MatrixBase<SparseProduct<LhsNested, RhsNested, ProductMode> > >::ret Base;
@ -130,7 +130,7 @@ class SparseProduct : ei_no_assignment_operator, public ei_traits<SparseProduct<
: m_lhs(lhs), m_rhs(rhs)
{
ei_assert(lhs.cols() == rhs.rows());
enum {
ProductIsValid = _LhsNested::ColsAtCompileTime==Dynamic
|| _RhsNested::RowsAtCompileTime==Dynamic
@ -182,7 +182,7 @@ struct ei_sparse_product_selector<Lhs,Rhs,ResultType,ColMajor,ColMajor,ColMajor>
AmbiVector<Scalar> tempVector(rows);
// estimate the number of non zero entries
float ratioLhs = float(lhs.nonZeros())/float(lhs.rows()*lhs.cols());
float ratioLhs = float(lhs.nonZeros())/(float(lhs.rows())*float(lhs.cols()));
float avgNnzPerRhsColumn = float(rhs.nonZeros())/float(cols);
float ratioRes = std::min(ratioLhs * avgNnzPerRhsColumn, 1.f);