<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'>> + // and points with projection value greater than zero are included in
> + // rightPoints.
> + leftPoints.resize(left);
> + rightPoints.resize(right);
> + for (size_t i = 0, rc = 0, lc = 0; i < points.n_elem; i++)
> + {
> + if (projections[i] <= 0)
> + {
> + leftPoints[lc] = points[i];
> + lc++;
> + }
> + else
> + {
> + rightPoints[rc] = points[i];
> + rc++;
> + }
</pre>
<p>If you wanted, you could compress this code a lot:</p>
<pre><code>if (projections[i] <= 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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