<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class template normal_distribution</title> <link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../boost_random/reference.html#header.boost.random.normal_distribution_hpp" title="Header <boost/random/normal_distribution.hpp>"> <link rel="prev" href="mt19937.html" title="Type definition mt19937"> <link rel="next" href="poisson_distribution.html" title="Class template poisson_distribution"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> <td align="center"><a href="../../../index.html">Home</a></td> <td 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normal_distribution</span></h2> <p>boost::normal_distribution</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../boost_random/reference.html#header.boost.random.normal_distribution_hpp" title="Header <boost/random/normal_distribution.hpp>">boost/random/normal_distribution.hpp</a>> </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> RealType <span class="special">=</span> <span class="keyword">double</span><span class="special">></span> <span class="keyword">class</span> <a class="link" href="normal_distribution.html" title="Class template normal_distribution">normal_distribution</a> <span class="special">{</span> <span class="keyword">public</span><span class="special">:</span> <span class="comment">// types</span> <span class="keyword">typedef</span> <span class="identifier">RealType</span> <a name="boost.normal_distribution.input_type"></a><span class="identifier">input_type</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">RealType</span> <a name="boost.normal_distribution.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> <span class="comment">// <a class="link" href="normal_distribution.html#boost.normal_distributionconstruct-copy-destruct">construct/copy/destruct</a></span> <a class="link" href="normal_distribution.html#id1151065-bb"><span class="identifier">normal_distribution</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">result_type</span> <span class="special">&</span> <span class="special">=</span> <span class="identifier">result_type</span><span class="special">(</span><span class="number">0</span><span class="special">)</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">result_type</span> <span class="special">&</span> <span class="special">=</span> <span class="identifier">result_type</span><span class="special">(</span><span class="number">1</span><span class="special">)</span><span class="special">)</span><span class="special">;</span> <a class="link" href="normal_distribution.html#id1151097-bb"><span class="identifier">normal_distribution</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="normal_distribution.html" title="Class template normal_distribution">normal_distribution</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="normal_distribution.html#id1151009-bb">public member functions</a></span> <span class="identifier">RealType</span> <a class="link" href="normal_distribution.html#id1151013-bb"><span class="identifier">mean</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="identifier">RealType</span> <a class="link" href="normal_distribution.html#id1151025-bb"><span class="identifier">sigma</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="keyword">void</span> <a class="link" href="normal_distribution.html#id1151037-bb"><span class="identifier">reset</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Engine<span class="special">></span> <span class="identifier">result_type</span> <a class="link" href="normal_distribution.html#id1151045-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Engine</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="special">}</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="id2511272"></a><h2>Description</h2> <p>Instantiations of class template normal_distribution model a <a class="link" href="../boost_random/reference.html#boost_random.reference.concepts.random_distribution" title="Random Distribution">random distribution</a> . Such a distribution produces random numbers <code class="computeroutput">x</code> distributed with probability density function <span class="inlinemediaobject"><img src="../images/random/form_8.png"></span>, where mean and sigma are the parameters of the distribution. </p> <div class="refsect2"> <a name="id2511317"></a><h3> <a name="boost.normal_distributionconstruct-copy-destruct"></a><code class="computeroutput">normal_distribution</code> public construct/copy/destruct</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><a name="id1151065-bb"></a><span class="identifier">normal_distribution</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">result_type</span> <span class="special">&</span> mean_arg <span class="special">=</span> <span class="identifier">result_type</span><span class="special">(</span><span class="number">0</span><span class="special">)</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">result_type</span> <span class="special">&</span> sigma_arg <span class="special">=</span> <span class="identifier">result_type</span><span class="special">(</span><span class="number">1</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre> <p>Constructs a normal_distribution object. <code class="computeroutput">mean</code> and <code class="computeroutput">sigma</code> are the parameters for the distribution.</p> <p>Requires: sigma > 0 </p> </li> <li class="listitem"><pre class="literallayout"><a name="id1151097-bb"></a><span class="identifier">normal_distribution</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="normal_distribution.html" title="Class template normal_distribution">normal_distribution</a> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre></li> </ol></div> </div> <div class="refsect2"> <a name="id2511518"></a><h3> <a name="id1151009-bb"></a><code class="computeroutput">normal_distribution</code> public member functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><span class="identifier">RealType</span> <a name="id1151013-bb"></a><span class="identifier">mean</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>Returns: The "mean" parameter of the distribution. </p> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">RealType</span> <a name="id1151025-bb"></a><span class="identifier">sigma</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>Returns: The "sigma" parameter of the distribution. </p> </li> <li class="listitem"><pre class="literallayout"><span class="keyword">void</span> <a name="id1151037-bb"></a><span class="identifier">reset</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li> <li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Engine<span class="special">></span> <span class="identifier">result_type</span> <a name="id1151045-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Engine</span> <span class="special">&</span> eng<span class="special">)</span><span class="special">;</span></pre></li> </ol></div> </div> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2000 -2005 Jens Maurer, 2009 Steven Watanabe<p> Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="mt19937.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost_random/reference.html#header.boost.random.normal_distribution_hpp"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="poisson_distribution.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>