epresent the state <span class="emphasis"><em>x</em></span>. In doing so, odeint is applicable
        for a broad variety of situations and it can be used with many other libraries.
        Besides the usual case where the state is defined as a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span></code>
        or a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="id