     the current state and time. Now, you only have to pass this container to
        the integration function:
      </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">state_type</span><span class="special">&gt;</span> <span class="identifier">x_vec</span><span class="special">;</span>
<span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">&gt;</spa