be assignable to a
<code>real</code> type.</p>
</div>
<div id="ode-solver-argument-types-and-origins" class="section level3">
<h3 class="unnumbered" number="">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 without control
parameters; in this case</p>
<ul>
<li><p>its first argument to refer to a function with signature
<code>(real, real[], real[], real[], int[]) : real[]</code>,</p></li>
<