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102 lines
3.7 KiB
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102 lines
3.7 KiB
HTML
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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="jN.html#jN" accesskey="n" rel="next">jN</a>, Previous: <a href="atan2.html#atan2" accesskey="p" rel="prev">atan2</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<a name="atanh_002c-atanhf_002d_002d_002dinverse-hyperbolic-tangent"></a>
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<h3 class="section">1.9 <code>atanh</code>, <code>atanhf</code>—inverse hyperbolic tangent</h3>
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<a name="index-atanh"></a>
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<a name="index-atanhf"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <math.h>
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double atanh(double <var>x</var>);
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float atanhf(float <var>x</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>atanh</code> calculates the inverse hyperbolic tangent of <var>x</var>.
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</p>
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<p><code>atanhf</code> is identical, other than taking and returning
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<code>float</code> values.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>atanh</code> and <code>atanhf</code> return the calculated value.
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</p>
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<p>If
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</p><div class="smallexample">
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<pre class="smallexample"><var>x</var>|
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</pre></div>
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<p>is greater than 1, the global <code>errno</code> is set to <code>EDOM</code> and
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the result is a NaN. A <code>DOMAIN error</code> is reported.
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</p>
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<p>If
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</p><div class="smallexample">
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<pre class="smallexample"><var>x</var>|
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</pre></div>
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<p>is 1, the global <code>errno</code> is set to <code>EDOM</code>; and the result is
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infinity with the same sign as <code>x</code>. A <code>SING error</code> is reported.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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Neither <code>atanh</code> nor <code>atanhf</code> are ANSI C.
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</p>
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<br>
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