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<div class="headertitle"><div class="title">realtime_stats.cpp File Reference</div></div>
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<p>Compute statistics for data entered in rreal-time.
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include <cassert></code><br />
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<code>#include <cmath></code><br />
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<code>#include <iostream></code><br />
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</div><div class="textblock"><div class="dynheader">
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Include dependency graph for realtime_stats.cpp:</div>
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<p><a href="../../d0/d08/realtime__stats_8cpp_source.html">Go to the source code of this file.</a></p>
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Classes</h2></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">statistics::stats_computer1< T ></a></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d8/dab/classstatistics_1_1stats__computer2.html">statistics::stats_computer2< T ></a></td></tr>
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Namespaces</h2></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">namespace  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/dcf/namespacestatistics.html">statistics</a></td></tr>
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<tr class="memdesc:d2/dcf/namespacestatistics"><td class="mdescLeft"> </td><td class="mdescRight">Statistical algorithms. <br /></td></tr>
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Functions</h2></td></tr>
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<tr class="memitem:aa54c915581fcc495489175a4386d59fd" id="r_aa54c915581fcc495489175a4386d59fd"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="#aa54c915581fcc495489175a4386d59fd">test_function</a> (const float *test_data, const int number_of_samples)</td></tr>
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<tr class="separator:aa54c915581fcc495489175a4386d59fd"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a3c04138a5bfe5d72780bb7e82a18e627" id="r_a3c04138a5bfe5d72780bb7e82a18e627"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="#a3c04138a5bfe5d72780bb7e82a18e627">main</a> (int argc, char **argv)</td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Compute statistics for data entered in rreal-time. </p>
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<p>This algorithm is really beneficial to compute statistics on data read in realtime. For example, devices reading biometrics data. The algorithm is simple enough to be easily implemented in an embedded system. </p><dl class="section author"><dt>Author</dt><dd><a href="https://github.com/kvedala" target="_blank">Krishna Vedala</a> </dd></dl>
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<p class="definition">Definition in file <a class="el" href="../../d0/d08/realtime__stats_8cpp_source.html">realtime_stats.cpp</a>.</p>
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</div><h2 class="groupheader">Function Documentation</h2>
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<a id="a3c04138a5bfe5d72780bb7e82a18e627" name="a3c04138a5bfe5d72780bb7e82a18e627"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a3c04138a5bfe5d72780bb7e82a18e627">◆ </a></span>main()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">int main </td>
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<td>(</td>
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<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>argc</em></span>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">char **</td> <td class="paramname"><span class="paramname"><em>argv</em></span> )</td>
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</table>
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</div><div class="memdoc">
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<p>Main function </p>
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<p class="definition">Definition at line <a class="el" href="../../d0/d08/realtime__stats_8cpp_source.html#l00158">158</a> of file <a class="el" href="../../d0/d08/realtime__stats_8cpp_source.html">realtime_stats.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 158</span> {</div>
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<div class="line"><span class="lineno"> 159</span> <span class="keyword">const</span> <span class="keywordtype">float</span> test_data1[] = {3, 4, 5, -1.4, -3.6, 1.9, 1.};</div>
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<div class="line"><span class="lineno"> 160</span> <a class="code hl_function" href="#aa54c915581fcc495489175a4386d59fd">test_function</a>(test_data1, <span class="keyword">sizeof</span>(test_data1) / <span class="keyword">sizeof</span>(test_data1[0]));</div>
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<div class="line"><span class="lineno"> 161</span> </div>
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<div class="line"><span class="lineno"> 162</span> std::cout</div>
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<div class="line"><span class="lineno"> 163</span> << <span class="stringliteral">"Enter data. Any non-numeric data will terminate the data input."</span></div>
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<div class="line"><span class="lineno"> 164</span> << std::endl;</div>
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<div class="line"><span class="lineno"> 165</span> </div>
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<div class="line"><span class="lineno"> 166</span> <a class="code hl_class" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">stats_computer1<float></a> stats1;</div>
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<div class="line"><span class="lineno"> 167</span> <a class="code hl_class" href="../../d8/dab/classstatistics_1_1stats__computer2.html">stats_computer2<float></a> stats2;</div>
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<div class="line"><span class="lineno"> 168</span> </div>
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<div class="line"><span class="lineno"> 169</span> <span class="keywordflow">while</span> (1) {</div>
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<div class="line"><span class="lineno"> 170</span> <span class="keywordtype">double</span> val;</div>
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<div class="line"><span class="lineno"> 171</span> std::cout << <span class="stringliteral">"Enter number: "</span>;</div>
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<div class="line"><span class="lineno"> 172</span> std::cin >> val;</div>
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<div class="line"><span class="lineno"> 173</span> </div>
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<div class="line"><span class="lineno"> 174</span> <span class="comment">// check for failure to read input. Happens for</span></div>
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<div class="line"><span class="lineno"> 175</span> <span class="comment">// non-numeric data</span></div>
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<div class="line"><span class="lineno"> 176</span> <span class="keywordflow">if</span> (std::cin.fail())</div>
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<div class="line"><span class="lineno"> 177</span> <span class="keywordflow">break</span>;</div>
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<div class="line"><span class="lineno"> 178</span> </div>
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<div class="line"><span class="lineno"> 179</span> stats1.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#aa13bf7c38de112f71921a5525d71a2f2">new_val</a>(val);</div>
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<div class="line"><span class="lineno"> 180</span> stats2.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#ade6de704deea24fdc88077b3d9a0d534">new_val</a>(val);</div>
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<div class="line"><span class="lineno"> 181</span> </div>
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<div class="line"><span class="lineno"> 182</span> std::cout << <span class="stringliteral">"\tMethod 1:"</span></div>
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<div class="line"><span class="lineno"> 183</span> << <span class="stringliteral">"\tMean: "</span> << stats1.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#a390697dcee210b91823ceff04b25081b">mean</a>()</div>
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<div class="line"><span class="lineno"> 184</span> << <span class="stringliteral">"\t Variance: "</span> << stats1.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#a27f0a03e2fd2254f1c81fe668226bd92">variance</a>()</div>
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<div class="line"><span class="lineno"> 185</span> << <span class="stringliteral">"\t Std: "</span> << stats1.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#af57e942d49f4fd70f059f224b4ac07e1">std</a>() << std::endl;</div>
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<div class="line"><span class="lineno"> 186</span> std::cout << <span class="stringliteral">"\tMethod 2:"</span></div>
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<div class="line"><span class="lineno"> 187</span> << <span class="stringliteral">"\tMean: "</span> << stats2.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#a8290966ad468f2a8c266d008bc60720e">mean</a>()</div>
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<div class="line"><span class="lineno"> 188</span> << <span class="stringliteral">"\t Variance: "</span> << stats2.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#af6198817084276113b3c064e87ce0555">variance</a>()</div>
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<div class="line"><span class="lineno"> 189</span> << <span class="stringliteral">"\t Std: "</span> << stats2.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#acf2e84df4fc386bb3295016ef8fd156e">std</a>() << std::endl;</div>
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<div class="line"><span class="lineno"> 190</span> }</div>
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<div class="line"><span class="lineno"> 191</span> </div>
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<div class="line"><span class="lineno"> 192</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 193</span>}</div>
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<div class="ttc" id="aclassstatistics_1_1stats__computer1_html"><div class="ttname"><a href="../../d7/d7c/classstatistics_1_1stats__computer1.html">statistics::stats_computer1</a></div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00027">realtime_stats.cpp:27</a></div></div>
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<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> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00045">realtime_stats.cpp:45</a></div></div>
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<div class="ttc" id="aclassstatistics_1_1stats__computer1_html_a390697dcee210b91823ceff04b25081b"><div class="ttname"><a href="../../d7/d7c/classstatistics_1_1stats__computer1.html#a390697dcee210b91823ceff04b25081b">statistics::stats_computer1::mean</a></div><div class="ttdeci">double mean() const</div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00042">realtime_stats.cpp:42</a></div></div>
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<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> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00032">realtime_stats.cpp:32</a></div></div>
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<div class="ttc" id="aclassstatistics_1_1stats__computer1_html_af57e942d49f4fd70f059f224b4ac07e1"><div class="ttname"><a href="../../d7/d7c/classstatistics_1_1stats__computer1.html#af57e942d49f4fd70f059f224b4ac07e1">statistics::stats_computer1::std</a></div><div class="ttdeci">double std() const</div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00048">realtime_stats.cpp:48</a></div></div>
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<div class="ttc" id="aclassstatistics_1_1stats__computer2_html"><div class="ttname"><a href="../../d8/dab/classstatistics_1_1stats__computer2.html">statistics::stats_computer2</a></div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00072">realtime_stats.cpp:72</a></div></div>
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<div class="ttc" id="aclassstatistics_1_1stats__computer2_html_a8290966ad468f2a8c266d008bc60720e"><div class="ttname"><a href="../../d8/dab/classstatistics_1_1stats__computer2.html#a8290966ad468f2a8c266d008bc60720e">statistics::stats_computer2::mean</a></div><div class="ttdeci">double mean() const</div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00086">realtime_stats.cpp:86</a></div></div>
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<div class="ttc" id="aclassstatistics_1_1stats__computer2_html_acf2e84df4fc386bb3295016ef8fd156e"><div class="ttname"><a href="../../d8/dab/classstatistics_1_1stats__computer2.html#acf2e84df4fc386bb3295016ef8fd156e">statistics::stats_computer2::std</a></div><div class="ttdeci">double std() const</div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00092">realtime_stats.cpp:92</a></div></div>
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<div class="ttc" id="aclassstatistics_1_1stats__computer2_html_ade6de704deea24fdc88077b3d9a0d534"><div class="ttname"><a href="../../d8/dab/classstatistics_1_1stats__computer2.html#ade6de704deea24fdc88077b3d9a0d534">statistics::stats_computer2::new_val</a></div><div class="ttdeci">void new_val(T x)</div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00077">realtime_stats.cpp:77</a></div></div>
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<div class="ttc" id="aclassstatistics_1_1stats__computer2_html_af6198817084276113b3c064e87ce0555"><div class="ttname"><a href="../../d8/dab/classstatistics_1_1stats__computer2.html#af6198817084276113b3c064e87ce0555">statistics::stats_computer2::variance</a></div><div class="ttdeci">double variance() const</div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00089">realtime_stats.cpp:89</a></div></div>
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<div class="ttc" id="arealtime__stats_8cpp_html_aa54c915581fcc495489175a4386d59fd"><div class="ttname"><a href="#aa54c915581fcc495489175a4386d59fd">test_function</a></div><div class="ttdeci">void test_function(const float *test_data, const int number_of_samples)</div><div class="ttdef"><b>Definition</b> <a href="../../d0/d08/realtime__stats_8cpp_source.html#l00118">realtime_stats.cpp:118</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#aa54c915581fcc495489175a4386d59fd">◆ </a></span>test_function()</h2>
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<td class="memname">void test_function </td>
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<td>(</td>
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<td class="paramtype">const float *</td> <td class="paramname"><span class="paramname"><em>test_data</em></span>, </td>
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<td class="paramtype">const int</td> <td class="paramname"><span class="paramname"><em>number_of_samples</em></span> )</td>
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<p>Test the algorithm implementation </p><dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">test_data</td><td>array of data to test the algorithms </td></tr>
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<p class="definition">Definition at line <a class="el" href="../../d0/d08/realtime__stats_8cpp_source.html#l00118">118</a> of file <a class="el" href="../../d0/d08/realtime__stats_8cpp_source.html">realtime_stats.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 118</span> {</div>
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<div class="line"><span class="lineno"> 119</span> <span class="keywordtype">float</span> mean = 0.f, variance = 0.f;</div>
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<div class="line"><span class="lineno"> 120</span> </div>
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<div class="line"><span class="lineno"> 121</span> <a class="code hl_class" href="../../d7/d7c/classstatistics_1_1stats__computer1.html">stats_computer1<float></a> stats01;</div>
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<div class="line"><span class="lineno"> 122</span> <a class="code hl_class" href="../../d8/dab/classstatistics_1_1stats__computer2.html">stats_computer2<float></a> stats02;</div>
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<div class="line"><span class="lineno"> 123</span> </div>
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<div class="line"><span class="lineno"> 124</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < number_of_samples; i++) {</div>
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<div class="line"><span class="lineno"> 125</span> stats01.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#aa13bf7c38de112f71921a5525d71a2f2">new_val</a>(test_data[i]);</div>
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<div class="line"><span class="lineno"> 126</span> stats02.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#ade6de704deea24fdc88077b3d9a0d534">new_val</a>(test_data[i]);</div>
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<div class="line"><span class="lineno"> 127</span> mean += test_data[i];</div>
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<div class="line"><span class="lineno"> 128</span> }</div>
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<div class="line"><span class="lineno"> 129</span> </div>
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<div class="line"><span class="lineno"> 130</span> mean /= number_of_samples;</div>
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<div class="line"><span class="lineno"> 131</span> </div>
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<div class="line"><span class="lineno"> 132</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < number_of_samples; i++) {</div>
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<div class="line"><span class="lineno"> 133</span> <span class="keywordtype">float</span> temp = test_data[i] - mean;</div>
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<div class="line"><span class="lineno"> 134</span> variance += temp * temp;</div>
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<div class="line"><span class="lineno"> 135</span> }</div>
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<div class="line"><span class="lineno"> 136</span> variance /= number_of_samples;</div>
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<div class="line"><span class="lineno"> 137</span> </div>
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<div class="line"><span class="lineno"> 138</span> std::cout << <span class="stringliteral">"<<<<<<<< Test Function >>>>>>>>"</span> << std::endl</div>
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<div class="line"><span class="lineno"> 139</span> << <span class="stringliteral">"Expected: Mean: "</span> << mean << <span class="stringliteral">"\t Variance: "</span> << variance</div>
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<div class="line"><span class="lineno"> 140</span> << std::endl;</div>
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<div class="line"><span class="lineno"> 141</span> std::cout << <span class="stringliteral">"\tMethod 1:"</span></div>
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<div class="line"><span class="lineno"> 142</span> << <span class="stringliteral">"\tMean: "</span> << stats01.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#a390697dcee210b91823ceff04b25081b">mean</a>()</div>
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<div class="line"><span class="lineno"> 143</span> << <span class="stringliteral">"\t Variance: "</span> << stats01.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#a27f0a03e2fd2254f1c81fe668226bd92">variance</a>()</div>
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<div class="line"><span class="lineno"> 144</span> << <span class="stringliteral">"\t Std: "</span> << stats01.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#af57e942d49f4fd70f059f224b4ac07e1">std</a>() << std::endl;</div>
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<div class="line"><span class="lineno"> 145</span> std::cout << <span class="stringliteral">"\tMethod 2:"</span></div>
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<div class="line"><span class="lineno"> 146</span> << <span class="stringliteral">"\tMean: "</span> << stats02.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#a8290966ad468f2a8c266d008bc60720e">mean</a>()</div>
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<div class="line"><span class="lineno"> 147</span> << <span class="stringliteral">"\t Variance: "</span> << stats02.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#af6198817084276113b3c064e87ce0555">variance</a>()</div>
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<div class="line"><span class="lineno"> 148</span> << <span class="stringliteral">"\t Std: "</span> << stats02.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#acf2e84df4fc386bb3295016ef8fd156e">std</a>() << std::endl;</div>
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<div class="line"><span class="lineno"> 149</span> </div>
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<div class="line"><span class="lineno"> 150</span> assert(std::abs(stats01.<a class="code hl_function" href="../../d7/d7c/classstatistics_1_1stats__computer1.html#a390697dcee210b91823ceff04b25081b">mean</a>() - mean) < 0.01);</div>
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<div class="line"><span class="lineno"> 151</span> assert(std::abs(stats02.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#a8290966ad468f2a8c266d008bc60720e">mean</a>() - mean) < 0.01);</div>
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<div class="line"><span class="lineno"> 152</span> assert(std::abs(stats02.<a class="code hl_function" href="../../d8/dab/classstatistics_1_1stats__computer2.html#af6198817084276113b3c064e87ce0555">variance</a>() - variance) < 0.01);</div>
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<div class="line"><span class="lineno"> 153</span> </div>
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<div class="line"><span class="lineno"> 154</span> std::cout << <span class="stringliteral">"(Tests passed)"</span> << std::endl;</div>
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<div class="line"><span class="lineno"> 155</span>}</div>
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