ssions</h3>
<p>The right-hand side may be any expression which has a type which is
assignable to the variable being declared. For example,</p>
<pre class="stan"><code>matrix[3, 2] a = 0.5 * (b + c);</code></pre>
<p>assigns the matrix variable <code>a</code> to half of the sum of <code>b</code> and <code>c</code>.
The only requirement on <code>b</code> and <code>c</code> is that the expression <code>b + c</code> be
of type <code>matrix</code>. For example, <code>b</code> could be of type <code>matrix</code> 