<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67956430">src/mlpack/core/tree/rectangle_tree/discrete_hilbert_value.hpp</a>:</p>
<pre style='color:#555'>> + const arma::Col<HilbertElemType>* ValueToInsert() const
> + { return valueToInsert; }
> +
> + private:
> + //! The number of bits that we can store
> + static constexpr size_t order = sizeof(HilbertElemType) * CHAR_BIT;
> + //! The local dataset
> + arma::Mat<HilbertElemType>* localDataset;
> + //! Indicates that the node owns the local dataset
> + bool ownsLocalDataset;
> + //! The number of values in the local dataset
> + size_t numValues;
> + //! The Hilbert value of the point that is being inserted
> + arma::Col<HilbertElemType>* valueToInsert;
> + //! Indicates that the node owns the valueToInsert
> + bool ownsValueToInsert;
</pre>
<p><code>valueToInsert</code> should be the same for all nodes. I use this variable in order to avoid multiple computations of the Hilbert value of a point that is being inserted. Since all points can be inserted only at the root level I compute the Hilbert value in <code>HandlePointInsertion</code> if the parent of the node is NULL.</p>
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