relativeneigh</a></span><span class="op">(</span><span class="va">NY8_ct_sf</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
</div>
<div class="section level4">
<h4 id="k-nearest-neighbours">K-nearest neighbours<a class="anchor" aria-label="anchor" href="#k-nearest-neighbours"></a>
</h4>
<p>K-nearest neighbours use the coordinate matrices, and can handle
Great Circle distances, but this is not demonstrated here, as the data
set used is planar, in which case <code><a href="h