92 lines
5.3 KiB
HTML
92 lines
5.3 KiB
HTML
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<title>std::negative_binomial_distribution<IntType>::negative_binomial_distribution</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::negative_binomial_distribution<IntType>::</span>negative_binomial_distribution</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-numeric.html">numeric</a>‎ | <a href="cpp-numeric-random.html">random</a>‎ | <a href="cpp-numeric-random-negative_binomial_distribution.html">negative binomial distribution</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">negative_binomial_distribution<span class="br0">(</span><span class="br0">)</span> <span class="sy4">:</span> negative_binomial_distribution<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> negative_binomial_distribution<span class="br0">(</span> IntType k, <span class="kw4">double</span> p <span class="sy1">=</span> <span class="nu16">0.5</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> negative_binomial_distribution<span class="br0">(</span> <span class="kw4">const</span> param_type<span class="sy3">&</span> params <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>构造新的分布对象。 <span class="t-v">(2)</span> 以 <code>k</code> 和 <code>p</code> 为分布参数， <span class="t-v">(3)</span> 以 <code>params</code> 为分布参数。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>k</td>
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<td>-</td>
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<td><i>k</i> 分布参数（试验成功次数）</td>
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<td>p</td>
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<td>-</td>
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<td><i>p</i> 分布参数（试验生成 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 的概率）</td>
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<td>params</td>
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<td>-</td>
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<td>分布参数集</td>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>要求 <span class="texhtml" style="white-space: nowrap;">0 < p ≤ 1</span> 和 <span class="texhtml" style="white-space: nowrap;">0 < k</span> 。</p>
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<p>若 <code>p == 1</code> ，则调用不接受 <code>param_type</code> 参数的 <a href="cpp-numeric-random-negative_binomial_distribution-operator().html"><tt>operator()</tt></a> 的重载将导致未定义行为。</p>
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<p>默认构造的 <code>std::negative_binomial_distribution</code> 等价于默认构造的 <span class="t-lc"><a href="cpp-numeric-random-geometric_distribution.html">std::geometric_distribution</a></span> 。</p>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<table class="dsctable" style="font-size:0.8em">
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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<td><a rel="nofollow" class="external text" href="https://wg21.link/P0935R0">P0935R0</a></td>
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<td>C++11</td>
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<td>默认构造函数曾为 explicit</td>
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<td>使之为隐式</td>
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