rray</span>[<span class="dv">5</span>] <span class="dt">matrix</span>[<span class="dv">3</span>, <span class="dv">4</span>] A;</span></code></pre></div>
<p>declares a variable <code>N</code> that is an integer, a variable <code>y</code> that is
a vector of length <code>N</code> (the previously declared variable), and a
variable <code>A</code>, which is a length-5 array where each element is a 3 by 4
matrix.</p>
<p>There are several different places a variable is declared in Stan. They are
block variables, l