e following declares the variable <code>x</code> to be less than or equal
to <span class="math inline">\(-1\)</span>.</p>
<pre class="stan"><code>real&lt;upper=-1&gt; x;</code></pre>
<p>To ensure <code>rho</code> takes on values between <span class="math inline">\(-1\)</span> and <span class="math inline">\(1\)</span>, use the
following declaration.</p>
<pre class="stan"><code>real&lt;lower=-1,upper=1&gt; rho;</code></pre>
<div id="infinite-constraints" class="section level4 unnumbered">
<h4>Infinite Constr