ces. The example</p>
<pre class="stan"><code>matrix[7, 2] mu[15, 12];</code></pre>
<p>declares a 15 by 12 array of <span class="math inline">\(7 \times 2\)</span> matrices. Any of the
constrained types may also be used in arrays, as in the declaration</p>
<pre class="stan"><code>cholesky_factor_cov[5, 6] mu[2, 3, 4];</code></pre>
<p>of a <span class="math inline">\(2 \times 3 \times 4\)</span> array of <span class="math inline">\(5 \times 6\)</span> Cholesky factors of
covariance matrices.</p>
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