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45 lines
1.9 KiB
HTML
45 lines
1.9 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>组合线性同余发生器</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.lcg-value" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">lcg_value</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">lcg_value</span> — <span class="dc-title">组合线性同余发生器</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.lcg-value-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>lcg_value</strong></span>
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( <span class="methodparam">void</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>lcg_value()</strong></span> 返回范围为
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(0, 1) 的一个伪随机数。本函数组合了周期为
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2^31 - 85 和 2^31 - 249 的两个同余发生器。本函数的周期等于这两个素数的乘积。
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.lcg-value-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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范围为 (0, 1) 的伪随机数。
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.lcg-value-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="rand.html" class="function" rel="rdfs-seeAlso">rand()</a> - 产生一个随机整数</span></li>
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<li class="member"><span class="function"><a href="mt_rand.html" class="function" rel="rdfs-seeAlso">mt_rand()</a> - 生成更好的随机数</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> |