ode> has implementation type <code>complex_vector</code> or
<code>complex_row_vector</code> and <code>i</code> is an expression of type <code>int</code>, then
<code>e[i]</code> is an expression of type <code>complex</code>, and</li>
<li>if <code>e</code> has implementation type <code>complex_matrix</code>, and <code>i</code> is an
expression of type <code>int</code>, then <code>e[i]</code> is an expression of type
<code>complex_row_vector</code>.</li>
</ul>
</div>
<div id="function-application" class="secti