</li>
</ul>
<p><code>integrate_1d</code> can accept an extra argument, which, like the
fourth and fifth arguments, must be expressions free of parameter
references. This optional sixth argument must be assignable to a
<code>real</code> type.</p>
</div>
<div id="ode-solver-argument-types-and-origins" class="section level3 unnumbered">
<h3>ODE solver argument types and origins</h3>
<p>The <code>integrate_ode</code>, <code>integrate_ode_rk45</code>, and
<code>integrate_ode_bdf</code> functions may be used with