ont of y, returning another row vector.</p>
<!-- row_vector; append_col; (row_vector x, real y); -->
<p></p>
<p><code>row_vector</code> <strong><code>append_col</code></strong><code>(row_vector x, real y)</code><br>
Append y to the end of x, returning another row vector.</p>
</div>
<div id="vertical-concatenation" class="section level4">
<h4><span class="header-section-number">5.10.0.2</span> Vertical concatenation</h4>
<!-- matrix; append_row; (matrix x, matrix y); -->
<p></p>
<p><code>matrix</code> <stron