tstyle \sum_{n=1}^N (x_n -
y_n)^2} \]</span> where <code>N</code> is the size of x and y. It is an error to call
<code>distance</code> with arguments of unequal size.</p>
<!-- real; distance; (vector x, row_vector y); -->
<p></p>
<p><code>real</code> <strong><code>distance</code></strong><code>(vector x, row_vector y)</code><br>
The Euclidean distance between x and y</p>
<!-- real; distance; (row_vector x, vector y); -->
<p></p>
<p><code>real</code> <strong><code>distance</code></strong><code>(row_vector x,