<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r74694705">src/mlpack/core/tree/spill_tree/spill_tree_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +    const double rho) :
&gt; +    left(NULL),
&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(dataset-&gt;n_cols);
&gt; +  for (size_t i = 0; i &lt; points.n_elem; i++)
&gt; +    points[i] = i;
</pre>
<p>You could use <code>arma::linspace()</code> here to fill this vector.</p>

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