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Fix setFromTripplet with empty inputs

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Gael Guennebaud 2013-05-03 14:28:37 +02:00
parent aa8b897607
commit fcdbfabf7a
1 changed files with 14 additions and 11 deletions
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25
Eigen/src/SparseCore/SparseMatrix.h
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@ -911,19 +911,22 @@ void set_from_triplets(const InputIterator& begin, const InputIterator& end, Spa
typedef typename SparseMatrixType::Scalar Scalar;
SparseMatrix<Scalar,IsRowMajor?ColMajor:RowMajor> trMat(mat.rows(),mat.cols());
// pass 1: count the nnz per inner-vector
VectorXi wi(trMat.outerSize());
wi.setZero();
for(InputIterator it(begin); it!=end; ++it)
wi(IsRowMajor ? it->col() : it->row())++;
if(begin<end)
{
// pass 1: count the nnz per inner-vector
VectorXi wi(trMat.outerSize());
wi.setZero();
for(InputIterator it(begin); it!=end; ++it)
wi(IsRowMajor ? it->col() : it->row())++;
// pass 2: insert all the elements into trMat
trMat.reserve(wi);
for(InputIterator it(begin); it!=end; ++it)
trMat.insertBackUncompressed(it->row(),it->col()) = it->value();
// pass 2: insert all the elements into trMat
trMat.reserve(wi);
for(InputIterator it(begin); it!=end; ++it)
trMat.insertBackUncompressed(it->row(),it->col()) = it->value();
// pass 3:
trMat.sumupDuplicates();
// pass 3:
trMat.sumupDuplicates();
}
// pass 4: transposed copy -> implicit sorting
mat = trMat;