e system function with exactly the
signature above.</p>
<p>The body of the system function here could also be coded using a row
vector constructor and transposition,</p>
<pre><code>  return [ y[1] - theta[1],
           y[1] * y[2] - theta[2] ]&#39;;</code></pre>
<p>As systems get more complicated, naming the intermediate expressions
goes a long way toward readability.</p>
<div id="strict-signature" class="section level4 unnumbered">
<h4>Strict Signature</h4>
<p>The function defining the system must have ex