stan code-with-copy"><code class="sourceCode stan"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="cf">for</span> (m <span class="cf">in</span> <span class="dv">1</span>:M) {</span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a>  <span class="cf">for</span> (n <span class="cf">in</span> <span class="dv">1</span>:N) {</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a>     a[m, n] = ...</span>
<span id="cb3-4"><a href="#c