<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r74704407">src/mlpack/core/tree/spill_tree/spill_tree_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  // and points with projection value greater than zero are included in
&gt; +  // rightPoints.
&gt; +  leftPoints.resize(left);
&gt; +  rightPoints.resize(right);
&gt; +  for (size_t i = 0, rc = 0, lc = 0; i &lt; points.n_elem; i++)
&gt; +  {
&gt; +    if (projections[i] &lt;= 0)
&gt; +    {
&gt; +      leftPoints[lc] = points[i];
&gt; +      lc++;
&gt; +    }
&gt; +    else
&gt; +    {
&gt; +      rightPoints[rc] = points[i];
&gt; +      rc++;
&gt; +    }
</pre>
<p>If you wanted, you could compress this code a lot:</p>

<pre><code>if (projections[i] &lt;= 0)
  leftPoints[lc++] = points[i];
else
  rightPoints[rc++] = points[i];
</code></pre>

<p>Whether or not you want to do that is your choice. :)</p>

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