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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Generates a random deviate from the exponential distribution</title>
</head>
<body class="docs"><div id="layout">
<div id="layout-content"><div id="function.stats-rand-gen-exponential" class="refentry">
<div class="refnamediv">
<h1 class="refname">stats_rand_gen_exponential</h1>
<p class="verinfo">(PECL stats &gt;= 1.0.0)</p><p class="refpurpose"><span class="refname">stats_rand_gen_exponential</span> &mdash; <span class="dc-title">Generates a random deviate from the exponential distribution</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.stats-rand-gen-exponential-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="methodname"><strong>stats_rand_gen_exponential</strong></span>
( <span class="methodparam"><span class="type">float</span> <code class="parameter">$av</code></span>
) : <span class="type">float</span></div>
<p class="para rdfs-comment">
Returns a random deviate from the exponential distribution of which the scale is
<code class="parameter">av</code>.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.stats-rand-gen-exponential-parameters">
<h3 class="title">参数</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">av</code></dt>
<dd>
<p class="para">
The scale parameter
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.stats-rand-gen-exponential-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
A random deviate
</p>
</div>
</div></div></div></body></html>