 values with three rows and four columns is
declared with the following.</p>
<pre class="stan"><code>array[3, 4] real a;</code></pre>
<p>A three-dimensional array <code>z</code> of positive reals with five rows, four
columns, and two shelves can be declared as follows.</p>
<pre class="stan"><code>array[5, 4, 2] real&lt;lower=0&gt; z;</code></pre>
<p>Arrays may also be declared to contain vectors. For example,</p>
<pre class="stan"><code>array[3] vector[7] mu;</code></pre>
<p>declares <code>mu</code> to be a