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86 lines
2.5 KiB
HTML
86 lines
2.5 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>两个参数的反正切</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.atan2" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">atan2</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">atan2</span> — <span class="dc-title">两个参数的反正切</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.atan2-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>atan2</strong></span>
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( <span class="methodparam"><span class="type">float</span> <code class="parameter">$y</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$x</code></span>
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) : <span class="type">float</span></div>
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<p class="simpara">
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本函数计算两个变量
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<code class="parameter">x</code> 和 <code class="parameter">y</code>
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的反正切值。和计算
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<code class="parameter">y</code> / <code class="parameter">x</code>
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的反正切相似，只除了两个参数的符号是用来确定结果的象限之外。
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</p>
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<p class="simpara">
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本函数的结果为弧度，其值在 -PI
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和 PI 之间（包括 -PI 和 PI）。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.atan2-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">y</code></dt>
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<dd>
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<p class="para">
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Dividend parameter
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</p>
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</dd>
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<dt>
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<code class="parameter">x</code></dt>
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<dd>
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<p class="para">
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Divisor parameter
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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.atan2-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<code class="parameter">x</code> 和 <code class="parameter">y</code>
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的反正切弧度值。
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.atan2-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="atan.html" class="function" rel="rdfs-seeAlso">atan()</a> - 反正切</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> |