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97 lines
3.0 KiB
HTML
97 lines
3.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>返回 exp(number) - 1，甚至当 number 的值接近零也能计算出准确结果</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.expm1" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">expm1</h1>
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<p class="verinfo">(PHP 4 >= 4.1.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">expm1</span> — <span class="dc-title">
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返回 exp(number) - 1，甚至当 number 的值接近零也能计算出准确结果
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.expm1-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>expm1</strong></span>
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( <span class="methodparam"><span class="type">float</span> <code class="parameter">$arg</code></span>
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) : <span class="type">float</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>expm1()</strong></span> 返回 'exp(<code class="parameter">number</code>) - 1'，甚至当
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<code class="parameter">number</code> 的值接近零也能计算出准确结果。但是当两个数值趋近于相等的时候，
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'exp (<code class="parameter">number</code>) - 1' 就会变得不太准确。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.expm1-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">arg</code></dt>
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<dd>
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<p class="para">
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要处理的参数
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.expm1-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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'e' to the power of <code class="parameter">arg</code> minus one
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.expm1-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.3.0</td>
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<td>
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此函数在所有平台上均可用
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.expm1-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="log1p.html" class="function" rel="rdfs-seeAlso">log1p()</a> - 返回 log(1 + number)，甚至当 number 的值接近零也能计算出准确结果</span></li>
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<li class="member"><span class="function"><a href="exp.html" class="function" rel="rdfs-seeAlso">exp()</a> - 计算 e 的指数</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |