nt[] x_i)</code></pre>
<p>The ODE system function should return the derivative of the state with
respect to time at the time provided. The length of the returned real
array must match the length of the state input into the function.</p>
<p>The arguments to this function are:</p>
<ul>
<li><p><em><code>time</code></em>, the time to evaluate the ODE system</p></li>
<li><p><em><code>state</code></em>, the state of the ODE system at the time specified</p></li>
<li><p><em><code>theta</code></em>, parameter values