sd</code>
function with an array of size 0.</p>
</div>
<div id="euclidean-distance-and-squared-distance" class="section level3">
<h3 number="4.1.4"><span class="header-section-number">4.1.4</span> Euclidean Distance and Squared Distance</h3>
<!-- real; distance; (vector x, vector y); -->
<p></p>
<p><code>real</code> <strong><code>distance</code></strong><code>(vector x, vector y)</code><br>
The Euclidean distance between x and y, defined by <span class="math display">\[
\text{distance}(x,y) \ = \ \sqrt{\tex