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test/sparse: fix bug
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unittest/sparse_matrix.cpp

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@@ -26,7 +26,8 @@ Eigen::SparseMatrix<Scalar, Options> matrix1x1(const Scalar& value) {
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template <typename Scalar, int Options>
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Eigen::SparseMatrix<Scalar, Options> diagonal(
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const Eigen::Ref<Eigen::Matrix<Scalar, Eigen::Dynamic, 1> >& diag_values) {
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const Eigen::Ref<const Eigen::Matrix<Scalar, Eigen::Dynamic, 1> >&
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diag_values) {
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typedef Eigen::SparseMatrix<Scalar, Options> ReturnType;
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ReturnType mat(diag_values.size(), diag_values.size());
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for (Eigen::Index k = 0; k < diag_values.size(); ++k)

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