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<tr class="memitem:a390697dcee210b91823ceff04b25081b" id="r_a390697dcee210b91823ceff04b25081b"><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a390697dcee210b91823ceff04b25081b">mean</a> () const</td></tr>
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Private Attributes</h2></td></tr>
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unsigned int&#160;</td><td class="memItemRight" valign="bottom"><b>n</b> = 0</td></tr>
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double&#160;</td><td class="memItemRight" valign="bottom"><b>Ex</b></td></tr>
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double&#160;</td><td class="memItemRight" valign="bottom"><b>Ex2</b></td></tr>
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T&#160;</td><td class="memItemRight" valign="bottom"><b>K</b></td></tr>
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Friends</h2></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><div class="compoundTemplParams">template&lt;typename T&gt;<br />
class statistics::stats_computer1&lt; T &gt;</div><p>continuous mean and variance computance using first value as an approximation for the mean. If the first number is much far form the mean, the algorithm becomes very inaccurate to compute variance and standard deviation. </p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a390697dcee210b91823ceff04b25081b" name="a390697dcee210b91823ceff04b25081b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a390697dcee210b91823ceff04b25081b">&#9670;&#160;</a></span>mean()</h2>
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template&lt;typename T &gt; </div>
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<td class="memname">double <a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">statistics::stats_computer1</a>&lt; T &gt;::mean </td>
<td>(</td>
<td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
<td> const</td>
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<p>return sample mean computed till last sample </p>
<div class="fragment"><div class="line"><span class="lineno"> 42</span>{ <span class="keywordflow">return</span> K + Ex / n; }</div>
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<a id="aa13bf7c38de112f71921a5525d71a2f2" name="aa13bf7c38de112f71921a5525d71a2f2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa13bf7c38de112f71921a5525d71a2f2">&#9670;&#160;</a></span>new_val()</h2>
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template&lt;typename T &gt; </div>
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<td class="memname">void <a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">statistics::stats_computer1</a>&lt; T &gt;::new_val </td>
<td>(</td>
<td class="paramtype">T</td> <td class="paramname"><span class="paramname"><em>x</em></span></td><td>)</td>
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<p>Constructor </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">x</td><td>new data sample </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><span class="lineno"> 32</span> {</div>
<div class="line"><span class="lineno"> 33</span> <span class="keywordflow">if</span> (n == 0)</div>
<div class="line"><span class="lineno"> 34</span> K = x;</div>
<div class="line"><span class="lineno"> 35</span> n++;</div>
<div class="line"><span class="lineno"> 36</span> T tmp = x - K;</div>
<div class="line"><span class="lineno"> 37</span> Ex += tmp;</div>
<div class="line"><span class="lineno"> 38</span> Ex2 += <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(tmp) * tmp;</div>
<div class="line"><span class="lineno"> 39</span> }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#af57e942d49f4fd70f059f224b4ac07e1">&#9670;&#160;</a></span>std()</h2>
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<td class="memname">double <a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">statistics::stats_computer1</a>&lt; T &gt;::std </td>
<td>(</td>
<td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
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<p>return sample standard deviation computed till last sample </p>
<div class="fragment"><div class="line"><span class="lineno"> 48</span>{ <span class="keywordflow">return</span> <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/math/sqrt.html">std::sqrt</a>(this-&gt;<a class="code hl_function" href="#a27f0a03e2fd2254f1c81fe668226bd92">variance</a>()); }</div>
<div class="ttc" id="aclassstatistics_1_1stats__computer1_html_a27f0a03e2fd2254f1c81fe668226bd92"><div class="ttname"><a href="#a27f0a03e2fd2254f1c81fe668226bd92">statistics::stats_computer1::variance</a></div><div class="ttdeci">double variance() const</div><div class="ttdef"><b>Definition</b> realtime_stats.cpp:45</div></div>
<div class="ttc" id="asqrt_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/numeric/math/sqrt.html">std::sqrt</a></div><div class="ttdeci">T sqrt(T... args)</div></div>
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Here is the call graph for this function:</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a27f0a03e2fd2254f1c81fe668226bd92">&#9670;&#160;</a></span>variance()</h2>
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<td class="memname">double <a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">statistics::stats_computer1</a>&lt; T &gt;::variance </td>
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<p>return data variance computed till last sample </p>
<div class="fragment"><div class="line"><span class="lineno"> 45</span>{ <span class="keywordflow">return</span> (Ex2 - (Ex * Ex) / n) / (n - 1); }</div>
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<h2 class="groupheader">Friends And Related Symbol Documentation</h2>
<a id="a350bf6c429691d3578c4dfc6679a0797" name="a350bf6c429691d3578c4dfc6679a0797"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a350bf6c429691d3578c4dfc6679a0797">&#9670;&#160;</a></span>operator&gt;&gt;</h2>
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<td class="memname"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::istream</a> &amp; operator&gt;&gt; </td>
<td>(</td>
<td class="paramtype"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::istream</a> &amp;</td> <td class="paramname"><span class="paramname"><em>input</em></span>, </td>
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<td class="paramtype"><a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">stats_computer1</a>&lt; T &gt; &amp;</td> <td class="paramname"><span class="paramname"><em>stat</em></span>&#160;)</td>
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<p>short-hand operator to read new sample from input stream <br />
e.g.: <code><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_istream.html">std::cin</a> &gt;&gt; stats1;</code> </p>
<div class="fragment"><div class="line"><span class="lineno"> 54</span> {</div>
<div class="line"><span class="lineno"> 55</span> T val;</div>
<div class="line"><span class="lineno"> 56</span> input &gt;&gt; val;</div>
<div class="line"><span class="lineno"> 57</span> stat.<a class="code hl_function" href="#aa13bf7c38de112f71921a5525d71a2f2">new_val</a>(val);</div>
<div class="line"><span class="lineno"> 58</span> <span class="keywordflow">return</span> input;</div>
<div class="line"><span class="lineno"> 59</span> }</div>
<div class="ttc" id="aclassstatistics_1_1stats__computer1_html_aa13bf7c38de112f71921a5525d71a2f2"><div class="ttname"><a href="#aa13bf7c38de112f71921a5525d71a2f2">statistics::stats_computer1::new_val</a></div><div class="ttdeci">void new_val(T x)</div><div class="ttdef"><b>Definition</b> realtime_stats.cpp:32</div></div>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>math/<a class="el" href="../../d0/d08/realtime__stats_8cpp.html">realtime_stats.cpp</a></li>
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