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+<a name="boost.accumulators.impl.weighted_density_impl"></a><div class="titlepage"></div>
+<div class="refnamediv">
+<h2><span class="refentrytitle">Struct template weighted_density_impl</span></h2>
+<p>boost::accumulators::impl::weighted_density_impl &#8212; Histogram density estimator for weighted samples. </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: &lt;<a class="link" href="../../../accumulators/reference.html#header.boost.accumulators.statistics.weighted_density_hpp" title="Header &lt;boost/accumulators/statistics/weighted_density.hpp&gt;">boost/accumulators/statistics/weighted_density.hpp</a>&gt;
+
+</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Sample<span class="special">,</span> <span class="keyword">typename</span> Weight<span class="special">&gt;</span>
+<span class="keyword">struct</span> <a class="link" href="weighted_density_impl.html" title="Struct template weighted_density_impl">weighted_density_impl</a> <span class="special">{</span>
+ <span class="comment">// types</span>
+ <span class="keyword">typedef</span> <span class="identifier">numeric</span><span class="special">::</span><span class="identifier">functional</span><span class="special">::</span><span class="identifier">fdiv</span><span class="special">&lt;</span> <span class="identifier">Weight</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.accumulators.impl.weighted_density_impl.float_type"></a><span class="identifier">float_type</span><span class="special">;</span>
+ <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span> <span class="identifier">float_type</span><span class="special">,</span> <span class="identifier">float_type</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <a name="boost.accumulators.impl.weighted_density_impl.histogram_type"></a><span class="identifier">histogram_type</span><span class="special">;</span>
+ <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span> <span class="identifier">float_type</span> <span class="special">&gt;</span> <a name="boost.accumulators.impl.weighted_density_impl.array_type"></a><span class="identifier">array_type</span><span class="special">;</span>
+ <span class="keyword">typedef</span> <span class="identifier">iterator_range</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">histogram_type</span><span class="special">::</span><span class="identifier">iterator</span> <span class="special">&gt;</span> <a name="boost.accumulators.impl.weighted_density_impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
+
+ <span class="comment">// <a class="link" href="weighted_density_impl.html#boost.accumulators.impl.weighted_density_implconstruct-copy-destruct">construct/copy/destruct</a></span>
+ <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Args<span class="special">&gt;</span> <a class="link" href="weighted_density_impl.html#idp35554464-bb"><span class="identifier">weighted_density_impl</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
+
+ <span class="comment">// <a class="link" href="weighted_density_impl.html#idp35548704-bb">public member functions</a></span>
+ <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Args<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="weighted_density_impl.html#idp35549264-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
+ <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Args<span class="special">&gt;</span> <span class="identifier">result_type</span> <a class="link" href="weighted_density_impl.html#idp35551648-bb"><span class="identifier">result</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
+<span class="special">}</span><span class="special">;</span></pre></div>
+<div class="refsect1">
+<a name="idp28168624"></a><h2>Description</h2>
+<p>The histogram density estimator returns a histogram of the sample distribution. The positions and sizes of the bins are determined using a specifiable number of cached samples (cache_size). The range between the minimum and the maximum of the cached samples is subdivided into a specifiable number of bins (num_bins) of same size. Additionally, an under- and an overflow bin is added to capture future under- and overflow samples. Once the bins are determined, the cached samples and all subsequent samples are added to the correct bins. At the end, a range of std::pair is returned, where each pair contains the position of the bin (lower bound) and the sum of the weights (normalized with the sum of all weights).</p>
+<p>
+</p>
+<div class="refsect2">
+<a name="idp28170992"></a><h3>
+<a name="boost.accumulators.impl.weighted_density_implconstruct-copy-destruct"></a><code class="computeroutput">weighted_density_impl</code>
+ public
+ construct/copy/destruct</h3>
+<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Args<span class="special">&gt;</span> <a name="idp35554464-bb"></a><span class="identifier">weighted_density_impl</span><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&amp;</span> args<span class="special">)</span><span class="special">;</span></pre></li></ol></div>
+</div>
+<div class="refsect2">
+<a name="idp28181584"></a><h3>
+<a name="idp35548704-bb"></a><code class="computeroutput">weighted_density_impl</code> public member functions</h3>
+<div class="orderedlist"><ol class="orderedlist" type="1">
+<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Args<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp35549264-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&amp;</span> args<span class="special">)</span><span class="special">;</span></pre></li>
+<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Args<span class="special">&gt;</span> <span class="identifier">result_type</span> <a name="idp35551648-bb"></a><span class="identifier">result</span><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&amp;</span> args<span class="special">)</span> <span class="keyword">const</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 &#169; 2005, 2006 Eric Niebler<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="../extract/weighted_density.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../accumulators/reference.html#header.boost.accumulators.statistics.weighted_density_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="../tag/weighted_density.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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