e" id="cb19"><pre class="sourceCode stan code-with-copy"><code class="sourceCode stan"><span id="cb19-1"><a href="#cb19-1" aria-hidden="true" tabindex="-1"></a><span class="co">// ... define: a = (5, 6, 7)</span></span>
<span id="cb19-2"><a href="#cb19-2" aria-hidden="true" tabindex="-1"></a>a[<span class="dv">2</span>] = a[<span class="dv">1</span>];      <span class="co">// result: a = (5, 5, 7)</span></span>
<span id="cb19-3"><a href="#cb19-3" aria-hidden="true" tabindex="-1"></a>a[<span class="dv">3</sp