<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r75061041">src/mlpack/core/tree/spill_tree/spill_tree_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +    right(NULL),
&gt; +    parent(NULL),
&gt; +    count(0),
&gt; +    pointsIndex(NULL),
&gt; +    overlappingNode(false),
&gt; +    hyperplane(),
&gt; +    bound(data.n_rows),
&gt; +    parentDistance(0), // Parent distance for the root is 0: it has no parent.
&gt; +    dataset(&amp;data),
&gt; +    localDataset(false)
&gt; +{
&gt; +  arma::Col&lt;size_t&gt; points;
&gt; +  if (dataset-&gt;n_cols &gt; 0)
&gt; +    // Fill points with all possible indexes: 0 .. (dataset-&gt;n_cols - 1).
&gt; +    points = arma::linspace&lt;arma::Col&lt;size_t&gt;&gt;(0, dataset-&gt;n_cols - 1,
&gt; +        dataset-&gt;n_cols);
</pre>
<p>Maybe just using <code>regspace()</code> is the better thing to do here, but I'm indifferent either way.</p>

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