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  26 <div class="refentry">
  27 <a name="boost.accumulators.impl.density_impl"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Struct template density_impl</span></h2>
  30 <p>boost::accumulators::impl::density_impl &#8212; Histogram density estimator. </p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <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_fwd_hpp" title="Header &lt;boost/accumulators/statistics_fwd.hpp&gt;">boost/accumulators/statistics_fwd.hpp</a>&gt;
  34
  35 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Sample<span class="special">&gt;</span>
  36 <span class="keyword">struct</span> <a class="link" href="density_impl.html" title="Struct template density_impl">density_impl</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">accumulator_base</span> <span class="special">{</span>
  37   <span class="comment">// <a class="link" href="density_impl.html#boost.accumulators.impl.density_implconstruct-copy-destruct">construct/copy/destruct</a></span>
  38   <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="density_impl.html#idp411024640-bb"><span class="identifier">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>
  39
  40   <span class="comment">// <a class="link" href="density_impl.html#idp411018080-bb">public member functions</a></span>
  41   <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="density_impl.html#idp411018640-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>
  42   <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="density_impl.html#idp411021024-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>
  43 <span class="special">}</span><span class="special">;</span></pre></div>
  44 <div class="refsect1">
  45 <a name="idp114977632"></a><h2>Description</h2>
  46 <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 return, where each pair contains the position of the bin (lower bound) and the samples count (normalized with the total number of samples).</p>
  47 <p>
  48 </p>
  49 <div class="refsect2">
  50 <a name="idp114980000"></a><h3>
  51 <a name="boost.accumulators.impl.density_implconstruct-copy-destruct"></a><code class="computeroutput">density_impl</code>
  52         public
  53        construct/copy/destruct</h3>
  54 <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="idp411024640-bb"></a><span class="identifier">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>
  55 </div>
  56 <div class="refsect2">
  57 <a name="idp114990592"></a><h3>
  58 <a name="idp411018080-bb"></a><code class="computeroutput">density_impl</code> public member functions</h3>
  59 <div class="orderedlist"><ol class="orderedlist" type="1">
  60 <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="idp411018640-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>
  61 <li class="listitem">
  62 <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="idp411021024-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>
  63 <p>
  64 </p>
  65 <div class="variablelist"><table border="0" class="variablelist compact">
  66 <colgroup>
  67 <col align="left" valign="top">
  68 <col>
  69 </colgroup>
  70 <tbody><tr>
  71 <td><p><span class="term">Requires:</span></p></td>
  72 <td><p>The number of samples must meet or exceed the cache size </p></td>
  73 </tr></tbody>
  74 </table></div>
  75 </li>
  76 </ol></div>
  77 </div>
  78 </div>
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  81 <td align="left"></td>
  82 <td align="right"><div class="copyright-footer">Copyright &#169; 2005, 2006 Eric Niebler<p>
  83         Distributed under the Boost Software License, Version 1.0. (See accompanying
  84         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>)
  85       </p>
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