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<tr class="memitem:aa13bf7c38de112f71921a5525d71a2f2"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#aa13bf7c38de112f71921a5525d71a2f2">new_val</a> (T x)</td></tr>
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<tr class="memitem:a27f0a03e2fd2254f1c81fe668226bd92"><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#a27f0a03e2fd2254f1c81fe668226bd92">variance</a> () const</td></tr>
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<tr class="memitem:af57e942d49f4fd70f059f224b4ac07e1"><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#af57e942d49f4fd70f059f224b4ac07e1">std</a> () const</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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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename T&gt;<br />
class statistics::stats_computer1&lt; T &gt;</h3>
<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>
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<h2 class="memtitle"><span class="permalink"><a href="#a390697dcee210b91823ceff04b25081b">&#9670;&nbsp;</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"></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"><a name="l00042"></a><span class="lineno"> 42</span>&#160;{ <span class="keywordflow">return</span> K + Ex / n; }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#aa13bf7c38de112f71921a5525d71a2f2">&#9670;&nbsp;</a></span>new_val()</h2>
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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>
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<td class="paramname"><em>x</em></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"><a name="l00032"></a><span class="lineno"> 32</span>&#160; {</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="keywordflow">if</span> (n == 0)</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; K = x;</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; n++;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; T tmp = x - K;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; Ex += tmp;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; Ex2 += <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(tmp) * tmp;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#af57e942d49f4fd70f059f224b4ac07e1">&#9670;&nbsp;</a></span>std()</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;::std </td>
<td>(</td>
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<p>return sample standard deviation computed till last sample </p>
<div class="fragment"><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;{ <span class="keywordflow">return</span> <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/math/sqrt.html">std::sqrt</a>(this-&gt;<a class="code" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#a27f0a03e2fd2254f1c81fe668226bd92">variance</a>()); }</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;&nbsp;</a></span>variance()</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;::variance </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>return data variance computed till last sample </p>
<div class="fragment"><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;{ <span class="keywordflow">return</span> (Ex2 - (Ex * Ex) / n) / (n - 1); }</div>
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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ab5b4bfecdf391cae7edb1fe98548b846">&#9670;&nbsp;</a></span>operator&gt;&gt;</h2>
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template&lt;typename T &gt; </div>
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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;&#160;</td>
<td class="paramname"><em>input</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">stats_computer1</a>&lt; T &gt; &amp;&#160;</td>
<td class="paramname"><em>stat</em>&#160;</td>
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<td></td>
<td>)</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"><a name="l00054"></a><span class="lineno"> 54</span>&#160; {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; T val;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; input &gt;&gt; val;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; stat.<a class="code" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#aa13bf7c38de112f71921a5525d71a2f2">new_val</a>(val);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordflow">return</span> input;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; }</div>
</div><!-- fragment -->
</div>
</div>
<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>
</ul>
</div><!-- contents -->
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<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>
<div class="ttc" id="aclassstatistics_1_1stats__computer1_html_aa13bf7c38de112f71921a5525d71a2f2"><div class="ttname"><a href="../../d7/d7c/classstatistics_1_1stats__computer1.html#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>
<div class="ttc" id="aclassstatistics_1_1stats__computer1_html_a27f0a03e2fd2254f1c81fe668226bd92"><div class="ttname"><a href="../../d7/d7c/classstatistics_1_1stats__computer1.html#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>
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