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<a name="ERF-_002d_002d_002d-Error-function"></a>
<h3 class="section">8.74 <code>ERF</code> &mdash; Error function</h3>
<a name="index-ERF"></a>
<a name="index-error-function"></a>
<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p><code>ERF(X)</code> computes the error function of <var>X</var>.
</p>
</dd>
<dt><em>Standard</em>:</dt>
<dd><p>Fortran 2008 and later
</p>
</dd>
<dt><em>Class</em>:</dt>
<dd><p>Elemental function
</p>
</dd>
<dt><em>Syntax</em>:</dt>
<dd><p><code>RESULT = ERF(X)</code>
</p>
</dd>
<dt><em>Arguments</em>:</dt>
<dd><table>
<tr><td width="15%"><var>X</var></td><td width="70%">The type shall be <code>REAL</code>.</td></tr>
</table>
</dd>
<dt><em>Return value</em>:</dt>
<dd><p>The return value is of type <code>REAL</code>, of the same kind as
<var>X</var> and lies in the range <em>-1 \leq erf (x) \leq 1 </em>.
</p>
</dd>
<dt><em>Example</em>:</dt>
<dd><div class="smallexample">
<pre class="smallexample">program test_erf
real(8) :: x = 0.17_8
x = erf(x)
end program test_erf
</pre></div>
</dd>
<dt><em>Specific names</em>:</dt>
<dd><table>
<tr><td width="20%">Name</td><td width="20%">Argument</td><td width="20%">Return type</td><td width="25%">Standard</td></tr>
<tr><td width="20%"><code>DERF(X)</code></td><td width="20%"><code>REAL(8) X</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">GNU extension</td></tr>
</table>
</dd>
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