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+<title>The GNU Fortran Compiler: ERF</title>
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+<p>
+Next: <a href="ERFC.html#ERFC" accesskey="n" rel="next">ERFC</a>, Previous: <a href="EPSILON.html#EPSILON" accesskey="p" rel="previous">EPSILON</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="ERF-_002d_002d_002d-Error-function"></a>
+<h3 class="section">8.95 <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>
+<thead><tr><th width="20%">Name</th><th width="23%">Argument</th><th width="20%">Return type</th><th width="33%">Standard</th></tr></thead>
+<tr><td width="20%"><code>DERF(X)</code></td><td width="23%"><code>REAL(8) X</code></td><td width="20%"><code>REAL(8)</code></td><td width="33%">GNU extension</td></tr>
+</table>
+</dd>
+</dl>
+
+
+
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