rent version</a>.
</div>
<div id="composed-functions" class="section level2">
<h2 number="3.14"><span class="header-section-number">3.14</span> Composed Functions</h2>
<p>The functions in this section are equivalent in theory to combinations
of other functions. In practice, they are implemented to be more
efficient and more numerically stable than defining them directly
using more basic Stan functions.</p>
<!-- R; expm1; (T x); -->
<p></p>
<p><code>R</code> <strong><code>expm1</code></strong><code>(T x)</co