 indexes reduce them. The following code shows how this works for multiple indexing of matrices.</p>
<div class="sourceCode" id="cb21"><pre class="sourceCode stan code-with-copy"><code class="sourceCode stan"><span id="cb21-1"><a href="#cb21-1" aria-hidden="true" tabindex="-1"></a><span class="dt">matrix</span>[<span class="dv">5</span>, <span class="dv">7</span>] m;</span>
<span id="cb21-2"><a href="#cb21-2" aria-hidden="true" tabindex="-1"></a><span class="co">// ...</span></span>
<span id="cb21-3"><a hre