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<div class="title">std::exponential_distribution< _RealType > Class Template Reference<div class="ingroups"><a class="el" href="a01473.html">Numerics</a> » <a class="el" href="a01491.html">Random Number Generation</a> » <a class="el" href="a01532.html">Random Number Distributions</a> » <a class="el" href="a01536.html">Poisson Distributions</a></div></div> </div>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="a06408.html">param_type</a></td></tr>
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Public Types</h2></td></tr>
<tr class="memitem:ac591303d7888e5576784bf67be998683"><td class="memItemLeft" align="right" valign="top">typedef _RealType </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a></td></tr>
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Public Member Functions</h2></td></tr>
<tr class="memitem:a2a29bf56b7218591ea6313052a17150d"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#a2a29bf56b7218591ea6313052a17150d">exponential_distribution</a> (const <a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> &__lambda=<a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a>(1))</td></tr>
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 </td><td class="memItemRight" valign="bottom"><b>exponential_distribution</b> (const <a class="el" href="a06408.html">param_type</a> &__p)</td></tr>
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template<typename _ForwardIterator , typename _UniformRandomNumberGenerator > </td></tr>
<tr class="memitem:a19f4762d8185bb2a65280692ec976ad8"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>__generate</b> (_ForwardIterator __f, _ForwardIterator __t, _UniformRandomNumberGenerator &__urng)</td></tr>
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template<typename _ForwardIterator , typename _UniformRandomNumberGenerator > </td></tr>
<tr class="memitem:a523c37673ded09fe1c5bbd12030dd2d5"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>__generate</b> (_ForwardIterator __f, _ForwardIterator __t, _UniformRandomNumberGenerator &__urng, const <a class="el" href="a06408.html">param_type</a> &__p)</td></tr>
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template<typename _UniformRandomNumberGenerator > </td></tr>
<tr class="memitem:addfb3422ce175b9fdfc0f3f7d9163b94"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><b>__generate</b> (<a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> *__f, <a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> *__t, _UniformRandomNumberGenerator &__urng, const <a class="el" href="a06408.html">param_type</a> &__p)</td></tr>
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<tr class="memitem:a03a1280a3dec72c2ca4045eaa026887b"><td class="memItemLeft" align="right" valign="top">_RealType </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#a03a1280a3dec72c2ca4045eaa026887b">lambda</a> () const</td></tr>
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<tr class="memitem:ac4d57abc4ee818a817139259105ef090"><td class="memItemLeft" align="right" valign="top"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#ac4d57abc4ee818a817139259105ef090">max</a> () const</td></tr>
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<tr class="memitem:a11a94d907e89a229cfd4083cb8e6a14c"><td class="memTemplParams" colspan="2">template<typename _UniformRandomNumberGenerator > </td></tr>
<tr class="memitem:a11a94d907e89a229cfd4083cb8e6a14c"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a06404.html#a11a94d907e89a229cfd4083cb8e6a14c">operator()</a> (_UniformRandomNumberGenerator &__urng)</td></tr>
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template<typename _UniformRandomNumberGenerator > </td></tr>
<tr class="memitem:a6e7aba83ef881852232232c5242231ff"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> </td><td class="memTemplItemRight" valign="bottom"><b>operator()</b> (_UniformRandomNumberGenerator &__urng, const <a class="el" href="a06408.html">param_type</a> &__p)</td></tr>
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<tr class="memitem:ac53c5c21d59b131a95ca5d5d8fdfe37a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#ac53c5c21d59b131a95ca5d5d8fdfe37a">param</a> (const <a class="el" href="a06408.html">param_type</a> &__param)</td></tr>
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<tr class="memitem:a1d72f5ccd6ee769af3d8cc82ed350e99"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#a1d72f5ccd6ee769af3d8cc82ed350e99">reset</a> ()</td></tr>
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Friends</h2></td></tr>
<tr class="memitem:acb5724229a97210048c27dba8f3a50b4"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a06404.html#acb5724229a97210048c27dba8f3a50b4">operator==</a> (const <a class="el" href="a06404.html">exponential_distribution</a> &__d1, const <a class="el" href="a06404.html">exponential_distribution</a> &__d2)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<typename _RealType = double><br />
class std::exponential_distribution< _RealType ></h3>
<p>An exponential continuous distribution for random numbers. </p>
<p>The formula for the exponential probability density function is <img class="formulaInl" alt="$p(x|\lambda) = \lambda e^{-\lambda x}$" src="form_20.png"/>.</p>
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<caption align="top">Distribution Statistics</caption>
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<td>Mean</td><td><img class="formulaInl" alt="$\frac{1}{\lambda}$" src="form_21.png"/> </td></tr>
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<td>Median</td><td><img class="formulaInl" alt="$\frac{\ln 2}{\lambda}$" src="form_22.png"/> </td></tr>
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<td>Mode</td><td><img class="formulaInl" alt="$zero$" src="form_23.png"/> </td></tr>
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<td>Range</td><td><img class="formulaInl" alt="$[0, \infty]$" src="form_24.png"/> </td></tr>
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<td>Standard Deviation</td><td><img class="formulaInl" alt="$\frac{1}{\lambda}$" src="form_21.png"/> </td></tr>
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<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04551">4551</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
</div><h2 class="groupheader">Member Typedef Documentation</h2>
<a id="ac591303d7888e5576784bf67be998683"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac591303d7888e5576784bf67be998683">◆ </a></span>result_type</h2>
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template<typename _RealType = double> </div>
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<td class="memname">typedef _RealType <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::<a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a></td>
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<p>The type of the range of the distribution. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04554">4554</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a2a29bf56b7218591ea6313052a17150d">◆ </a></span>exponential_distribution()</h2>
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template<typename _RealType = double> </div>
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<td class="memname"><a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::<a class="el" href="a06404.html">exponential_distribution</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a> & </td>
<td class="paramname"><em>__lambda</em> = <code><a class="el" href="a06404.html#ac591303d7888e5576784bf67be998683">result_type</a>(1)</code></td><td>)</td>
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<p>Constructs an exponential distribution with inverse scale parameter <img class="formulaInl" alt="$\lambda$" src="form_37.png"/>. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04594">4594</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a03a1280a3dec72c2ca4045eaa026887b">◆ </a></span>lambda()</h2>
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<p>Returns the inverse scale parameter of the distribution. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04615">4615</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="a17055_source.html#l01734">std::operator<<()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac4d57abc4ee818a817139259105ef090">◆ </a></span>max()</h2>
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template<typename _RealType = double> </div>
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<p>Returns the least upper bound value of the distribution. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04644">4644</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
<p class="reference">References <a class="el" href="a00095_source.html#l00321">std::numeric_limits< _Tp >::max()</a>.</p>
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template<typename _RealType = double> </div>
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<p>Returns the greatest lower bound value of the distribution. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04637">4637</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a11a94d907e89a229cfd4083cb8e6a14c">◆ </a></span>operator()()</h2>
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template<typename _RealType = double> </div>
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template<typename _UniformRandomNumberGenerator > </div>
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<p>Generating functions. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04652">4652</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<p>Returns the parameter set of the distribution. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04622">4622</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="a17055_source.html#l01757">std::operator>>()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac53c5c21d59b131a95ca5d5d8fdfe37a">◆ </a></span>param() <span class="overload">[2/2]</span></h2>
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template<typename _RealType = double> </div>
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<td class="memname">void <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::param </td>
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<td class="paramtype">const <a class="el" href="a06408.html">param_type</a> & </td>
<td class="paramname"><em>__param</em></td><td>)</td>
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<p>Sets the parameter set of the distribution. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">__param</td><td>The new parameter set of the distribution. </td></tr>
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<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04630">4630</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1d72f5ccd6ee769af3d8cc82ed350e99">◆ </a></span>reset()</h2>
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template<typename _RealType = double> </div>
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<td class="memname">void <a class="el" href="a06404.html">std::exponential_distribution</a>< _RealType >::reset </td>
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<p>Resets the distribution state. </p>
<p>Has no effect on exponential distributions. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04609">4609</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#acb5724229a97210048c27dba8f3a50b4">◆ </a></span>operator==</h2>
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template<typename _RealType = double> </div>
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<td class="memname">bool operator== </td>
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<td class="paramtype">const <a class="el" href="a06404.html">exponential_distribution</a>< _RealType > & </td>
<td class="paramname"><em>__d1</em>, </td>
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<td class="paramtype">const <a class="el" href="a06404.html">exponential_distribution</a>< _RealType > & </td>
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<p>Return true if two exponential distributions have the same parameters. </p>
<p class="definition">Definition at line <a class="el" href="a00452_source.html#l04692">4692</a> of file <a class="el" href="a00452_source.html">random.h</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="a00452_source.html">random.h</a></li>
<li><a class="el" href="a17055_source.html">bits/random.tcc</a></li>
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