lass="special">);</span>
<span class="keyword">long</span> <span class="keyword">double</span> <span class="identifier">erfl</span><span class="special">(</span><span class="keyword">long</span> <span class="keyword">double</span> <span class="identifier">x</span><span class="special">);</span>
</pre>
<p>
      Returns the error function of <span class="emphasis"><em>x</em></span>:
    </p>
<p>
      <span class="inlinemediaobject"><img src="../../equations/erf1.svg"></span>
    </p>
<p>
      See also <a c