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90 lines
2.7 KiB
HTML
90 lines
2.7 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>Returns the standard deviation</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.stats-standard-deviation" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">stats_standard_deviation</h1>
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<p class="verinfo">(PECL stats >= 1.0.0)</p><p class="refpurpose"><span class="refname">stats_standard_deviation</span> — <span class="dc-title">Returns the standard deviation</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.stats-standard-deviation-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>stats_standard_deviation</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$a</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$sample</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
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] ) : <span class="type">float</span></div>
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<p class="para rdfs-comment">
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Returns the standard deviation of the values in <code class="parameter">a</code>.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.stats-standard-deviation-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">a</code></dt>
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<dd>
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<p class="para">
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The array of data to find the standard deviation for. Note that all
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values of the array will be cast to <span class="type"><a href="language.types.float.html" class="type float">float</a></span>.
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</p>
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</dd>
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<dt>
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<code class="parameter">sample</code></dt>
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<dd>
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<p class="para">
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Indicates if <code class="parameter">a</code> represents a sample of the
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population; defaults to <strong><code>FALSE</code></strong>.
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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.stats-standard-deviation-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the standard deviation on success; <strong><code>FALSE</code></strong> on failure.
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</p>
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</div>
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<div class="refsect1 errors" id="refsect1-function.stats-standard-deviation-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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Raises an <strong><code>E_WARNING</code></strong> when there are fewer than 2
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values in <code class="parameter">a</code>.
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</p>
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</div>
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</div></div></div></body></html> |