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92 lines
3.4 KiB
HTML
92 lines
3.4 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>expm1 (LIBM)</title>
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<meta name="description" content="expm1 (LIBM)">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<body lang="en">
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<a name="expm1"></a>
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<div class="header">
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<p>
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Next: <a href="fabs.html#fabs" accesskey="n" rel="next">fabs</a>, Previous: <a href="exp2.html#exp2" accesskey="p" rel="prev">exp2</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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</div>
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<hr>
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<a name="expm1_002c-expm1f_002d_002d_002dexponential-minus-1"></a>
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<h3 class="section">1.18 <code>expm1</code>, <code>expm1f</code>—exponential minus 1</h3>
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<a name="index-expm1"></a>
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<a name="index-expm1f"></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 expm1(double <var>x</var>);
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float expm1f(float <var>x</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>expm1</code> and <code>expm1f</code> calculate the exponential of <var>x</var>
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and subtract 1, that is,
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e raised to the power <var>x</var> minus 1 (where e
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is the base of the natural system of logarithms, approximately
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2.71828). The result is accurate even for small values of
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<var>x</var>, where using <code>exp(<var>x</var>)-1</code> would lose many
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significant digits.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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e raised to the power <var>x</var>, minus 1.
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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>expm1</code> nor <code>expm1f</code> is required by ANSI C or by
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the System V Interface Definition (Issue 2).
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</p>
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<br>
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