143 lines
5.2 KiB
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143 lines
5.2 KiB
HTML
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<head>
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<title>The GNU Fortran Compiler: ATANH</title>
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Intrinsic-Procedures.html#Intrinsic-Procedures" rel="up" title="Intrinsic Procedures">
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<link href="ATOMIC_005fADD.html#ATOMIC_005fADD" rel="next" title="ATOMIC_ADD">
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<link href="ATAN2.html#ATAN2" rel="prev" title="ATAN2">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="ATANH"></a>
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<div class="header">
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<p>
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Next: <a href="ATOMIC_005fADD.html#ATOMIC_005fADD" accesskey="n" rel="next">ATOMIC_ADD</a>, Previous: <a href="ATAN2.html#ATAN2" accesskey="p" rel="prev">ATAN2</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<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>
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</div>
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<hr>
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<a name="ATANH-_002d_002d_002d-Inverse-hyperbolic-tangent-function"></a>
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<h3 class="section">9.23 <code>ATANH</code> — Inverse hyperbolic tangent function</h3>
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<a name="index-ATANH"></a>
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<a name="index-DATANH"></a>
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<a name="index-area-hyperbolic-tangent"></a>
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<a name="index-inverse-hyperbolic-tangent"></a>
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<a name="index-hyperbolic-function_002c-tangent_002c-inverse"></a>
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<a name="index-tangent_002c-hyperbolic_002c-inverse"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>ATANH(X)</code> computes the inverse hyperbolic tangent of <var>X</var>.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 2008 and later
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Elemental function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>RESULT = ATANH(X)</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>X</var></td><td width="70%">The type shall be <code>REAL</code> or <code>COMPLEX</code>.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The return value has same type and kind as <var>X</var>. If <var>X</var> is
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complex, the imaginary part of the result is in radians and lies between
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<em>-\pi/2 \leq \Im \atanh(x) \leq \pi/2</em>.
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">PROGRAM test_atanh
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REAL, DIMENSION(3) :: x = (/ -1.0, 0.0, 1.0 /)
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WRITE (*,*) ATANH(x)
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END PROGRAM
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</pre></div>
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</dd>
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<dt><em>Specific names</em>:</dt>
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<dd><table>
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<tr><td width="20%">Name</td><td width="20%">Argument</td><td width="20%">Return type</td><td width="25%">Standard</td></tr>
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<tr><td width="20%"><code>DATANH(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>
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</table>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p>Inverse function: <a href="TANH.html#TANH">TANH</a>
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</p></dd>
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</dl>
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</body>
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