ow_vector</code> for row vectors, and <code>matrix</code> for
matrices.</p>
<p>Stan also provides three complex-valued matrix data types,
<code>complex_vector</code> for column vectors, <code>complex_row_vector</code> for row
vectors, and <code>complex_matrix</code> for matrices.</p>
</div>
<div id="array-types" class="section level3 unnumbered">
<h3>Array types</h3>
<p>Any type (including the constrained types discussed in the next
section) can be made into an array type by declaring array arguments.
For e