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<title>Struct template lazy_variance_impl</title>
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<a name="boost.accumulators.impl.lazy_variance_impl"></a><div class="titlepage"></div>
<p>boost::accumulators::impl::lazy_variance_impl — Lazy calculation of variance. </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="../../../accumulators/reference.html#header.boost.accumulators.statistics.variance_hpp" title="Header <boost/accumulators/statistics/variance.hpp>">boost/accumulators/statistics/variance.hpp</a>>
+<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="../../../accumulators/reference.html#header.boost.accumulators.statistics_fwd_hpp" title="Header <boost/accumulators/statistics_fwd.hpp>">boost/accumulators/statistics_fwd.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sample<span class="special">,</span> <span class="keyword">typename</span> MeanFeature<span class="special">></span>
-<span class="keyword">struct</span> <a class="link" href="lazy_variance_impl.html" title="Struct template lazy_variance_impl">lazy_variance_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">average</span><span class="special"><</span> <span class="identifier">Sample</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">></span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.accumulators.impl.lazy_variance_impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
-
+<span class="keyword">struct</span> <a class="link" href="lazy_variance_impl.html" title="Struct template lazy_variance_impl">lazy_variance_impl</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">accumulator_base</span> <span class="special">{</span>
<span class="comment">// <a class="link" href="lazy_variance_impl.html#boost.accumulators.impl.lazy_variance_implconstruct-copy-destruct">construct/copy/destruct</a></span>
- <a class="link" href="lazy_variance_impl.html#id572226-bb"><span class="identifier">lazy_variance_impl</span></a><span class="special">(</span><span class="identifier">dont_care</span><span class="special">)</span><span class="special">;</span>
+ <a class="link" href="lazy_variance_impl.html#idp67184688-bb"><span class="identifier">lazy_variance_impl</span></a><span class="special">(</span><span class="identifier">dont_care</span><span class="special">)</span><span class="special">;</span>
- <span class="comment">// <a class="link" href="lazy_variance_impl.html#id572203-bb">public member functions</a></span>
- <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Args<span class="special">></span> <span class="identifier">result_type</span> <a class="link" href="lazy_variance_impl.html#id572206-bb"><span class="identifier">result</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
+ <span class="comment">// <a class="link" href="lazy_variance_impl.html#idp67181312-bb">public member functions</a></span>
+ <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Args<span class="special">></span> <span class="identifier">result_type</span> <a class="link" href="lazy_variance_impl.html#idp67181872-bb"><span class="identifier">result</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&</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="id949795"></a><h2>Description</h2>
-<p>Default sample variance implementation based on the second moment <span class="inlinemediaobject"><img src="../../../images/accumulators/form_72.png"></span> moment<2>, mean and count. </p>
+<a name="idp111205920"></a><h2>Description</h2>
+<p>Default sample variance implementation based on the second moment <span class="inlinemediaobject"><img src="../../../images/accumulators//form_58.png"></span> moment<2>, mean and count. </p>
<div class="equation">
-<a name="id949824"></a><p class="title"><b>Equation 1.21. </b></p>
-<div class="equation-contents"><div class="mediaobject" align="center"><img src="../../../images/accumulators/form_73.png" align="middle"></div></div>
+<a name="idp111209056"></a><p class="title"><b>Equation 1.29. </b></p>
+<div class="equation-contents"><div class="mediaobject" align="center"><img src="../../../images/accumulators//form_59.png" align="middle"></div></div>
</div>
<p><br class="equation-break"> where </p>
<div class="equation">
-<a name="id949847"></a><p class="title"><b>Equation 1.22. </b></p>
-<div class="equation-contents"><div class="mediaobject" align="center"><img src="../../../images/accumulators/form_74.png" align="middle"></div></div>
+<a name="idp111211904"></a><p class="title"><b>Equation 1.30. </b></p>
+<div class="equation-contents"><div class="mediaobject" align="center"><img src="../../../images/accumulators//form_60.png" align="middle"></div></div>
</div>
-<p><br class="equation-break"> is the estimate of the sample mean and <span class="inlinemediaobject"><img src="../../../images/accumulators/form_60.png"></span> is the number of samples. </p>
+<p><br class="equation-break"> is the estimate of the sample mean and <span class="inlinemediaobject"><img src="../../../images/accumulators//form_47.png"></span> is the number of samples. </p>
<div class="refsect2">
-<a name="id949891"></a><h3>
+<a name="idp111217184"></a><h3>
<a name="boost.accumulators.impl.lazy_variance_implconstruct-copy-destruct"></a><code class="computeroutput">lazy_variance_impl</code>
public
construct/copy/destruct</h3>
-<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><a name="id572226-bb"></a><span class="identifier">lazy_variance_impl</span><span class="special">(</span><span class="identifier">dont_care</span><span class="special">)</span><span class="special">;</span></pre></li></ol></div>
+<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><a name="idp67184688-bb"></a><span class="identifier">lazy_variance_impl</span><span class="special">(</span><span class="identifier">dont_care</span><span class="special">)</span><span class="special">;</span></pre></li></ol></div>
</div>
<div class="refsect2">
-<a name="id949946"></a><h3>
-<a name="id572203-bb"></a><code class="computeroutput">lazy_variance_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"><</span><span class="keyword">typename</span> Args<span class="special">></span> <span class="identifier">result_type</span> <a name="id572206-bb"></a><span class="identifier">result</span><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&</span> args<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li></ol></div>
+<a name="idp111223728"></a><h3>
+<a name="idp67181312-bb"></a><code class="computeroutput">lazy_variance_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"><</span><span class="keyword">typename</span> Args<span class="special">></span> <span class="identifier">result_type</span> <a name="idp67181872-bb"></a><span class="identifier">result</span><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&</span> args<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li></ol></div>
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