<p>In <a href="https://github.com/mlpack/mlpack/pull/699#discussion_r69010016">src/mlpack/tests/rectangle_tree_test.cpp</a>:</p>
<pre style='color:#555'>&gt; +{
&gt; +  arma::mat dataset;
&gt; +
&gt; +  const int numP = 1000;
&gt; +
&gt; +  dataset.randu(8, numP); // 1000 points in 8 dimensions.
&gt; +  arma::Mat&lt;size_t&gt; neighbors1;
&gt; +  arma::mat distances1;
&gt; +  arma::Mat&lt;size_t&gt; neighbors2;
&gt; +  arma::mat distances2;
&gt; +
&gt; +  typedef RPlusTree&lt;EuclideanDistance, NeighborSearchStat&lt;NearestNeighborSort&gt;,
&gt; +      arma::mat&gt; TreeType;
&gt; +  TreeType rPlusTree(dataset, 20, 6, 5, 2, 0);
&gt; +
&gt; +  // Nearest neighbor search with the X tree.
</pre>
<p>This comment is out of date, we should change it to say R+ tree.  The same applies for the R++ tree test below.  I know, it is a trivial comment. :)</p>

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