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<div class="headertitle"><div class="title">golden_search_extrema.cpp File Reference</div></div>
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<div class="contents">
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<p>Find extrema of a univariate real function in a given interval using <a href="https://en.wikipedia.org/wiki/Golden-section_search" target="_blank">golden section search algorithm</a>.
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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 <functional></code><br />
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<code>#include <iostream></code><br />
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<code>#include <limits></code><br />
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</div><div class="textblock"><div class="dynheader">
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Include dependency graph for golden_search_extrema.cpp:</div>
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<div class="dyncontent">
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Macros</h2></td></tr>
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<tr class="memitem:a525335710b53cb064ca56b936120431e" id="r_a525335710b53cb064ca56b936120431e"><td class="memItemLeft" align="right" valign="top"><a id="a525335710b53cb064ca56b936120431e" name="a525335710b53cb064ca56b936120431e"></a>
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#define </td><td class="memItemRight" valign="bottom"><b>_USE_MATH_DEFINES</b></td></tr>
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<tr class="separator:a525335710b53cb064ca56b936120431e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a002b2f4894492820fe708b1b7e7c5e70" id="r_a002b2f4894492820fe708b1b7e7c5e70"><td class="memItemLeft" align="right" valign="top"><a id="a002b2f4894492820fe708b1b7e7c5e70" name="a002b2f4894492820fe708b1b7e7c5e70"></a>
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#define </td><td class="memItemRight" valign="bottom"><b>EPSILON</b>   1e-7</td></tr>
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<tr class="memdesc:a002b2f4894492820fe708b1b7e7c5e70"><td class="mdescLeft"> </td><td class="mdescRight">solution accuracy limit <br /></td></tr>
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<tr class="separator:a002b2f4894492820fe708b1b7e7c5e70"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:a1aa76a6d5fd4d333f9072beff1dc486b" id="r_a1aa76a6d5fd4d333f9072beff1dc486b"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="#a1aa76a6d5fd4d333f9072beff1dc486b">get_minima</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/functional/function.html">std::function</a>< double(double)> &f, double lim_a, double lim_b)</td></tr>
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<tr class="memdesc:a1aa76a6d5fd4d333f9072beff1dc486b"><td class="mdescLeft"> </td><td class="mdescRight">Get the minima of a function in the given interval. To get the maxima, simply negate the function. The golden ratio used here is: <br /></td></tr>
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<tr class="separator:a1aa76a6d5fd4d333f9072beff1dc486b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1440a7779ac56f47a3f355ce4a8c7da0" id="r_a1440a7779ac56f47a3f355ce4a8c7da0"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="#a1440a7779ac56f47a3f355ce4a8c7da0">test1</a> ()</td></tr>
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<tr class="memdesc:a1440a7779ac56f47a3f355ce4a8c7da0"><td class="mdescLeft"> </td><td class="mdescRight">Test function to find minima for the function \(f(x)= (x-2)^2\) in the interval \([1,5]\) <br />
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Expected result = 2. <br /></td></tr>
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<tr class="separator:a1440a7779ac56f47a3f355ce4a8c7da0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a0283886819c7c140a023582b7269e2d0" id="r_a0283886819c7c140a023582b7269e2d0"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="#a0283886819c7c140a023582b7269e2d0">test2</a> ()</td></tr>
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<tr class="memdesc:a0283886819c7c140a023582b7269e2d0"><td class="mdescLeft"> </td><td class="mdescRight">Test function to find <em>maxima</em> for the function \(f(x)= x^{\frac{1}{x}}\) in the interval \([-2,10]\) <br />
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Expected result: \(e\approx 2.71828182845904509\). <br /></td></tr>
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<tr class="separator:a0283886819c7c140a023582b7269e2d0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6d0455dd5c30adda100e95f0423c786e" id="r_a6d0455dd5c30adda100e95f0423c786e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="#a6d0455dd5c30adda100e95f0423c786e">test3</a> ()</td></tr>
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<tr class="memdesc:a6d0455dd5c30adda100e95f0423c786e"><td class="mdescLeft"> </td><td class="mdescRight">Test function to find <em>maxima</em> for the function \(f(x)= \cos x\) in the interval \([0,12]\) <br />
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Expected result: \(\pi\approx 3.14159265358979312\). <br /></td></tr>
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<tr class="separator:a6d0455dd5c30adda100e95f0423c786e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4" id="r_ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memSeparator" colspan="2"> </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>Find extrema of a univariate real function in a given interval using <a href="https://en.wikipedia.org/wiki/Golden-section_search" target="_blank">golden section search algorithm</a>. </p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="../../db/d01/brent__method__extrema_8cpp.html" title="Find real extrema of a univariate real function in a given interval using Brent's method.">brent_method_extrema.cpp</a> </dd></dl>
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<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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</div><h2 class="groupheader">Function Documentation</h2>
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<a id="a1aa76a6d5fd4d333f9072beff1dc486b" name="a1aa76a6d5fd4d333f9072beff1dc486b"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a1aa76a6d5fd4d333f9072beff1dc486b">◆ </a></span>get_minima()</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">double get_minima </td>
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<td>(</td>
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<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/functional/function.html">std::function</a>< double(double)> &</td> <td class="paramname"><span class="paramname"><em>f</em></span>, </td>
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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">double</td> <td class="paramname"><span class="paramname"><em>lim_a</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">double</td> <td class="paramname"><span class="paramname"><em>lim_b</em></span> )</td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Get the minima of a function in the given interval. To get the maxima, simply negate the function. The golden ratio used here is: </p>
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<p class="formulaDsp">
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\[
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k=\frac{3-\sqrt{5}}{2} \approx 0.381966\ldots\]
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</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">f</td><td>function to get minima for </td></tr>
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<tr><td class="paramname">lim_a</td><td>lower limit of search window </td></tr>
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<tr><td class="paramname">lim_b</td><td>upper limit of search window </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>local minima found in the interval </dd></dl>
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<div class="fragment"><div class="line"><span class="lineno"> 30</span> {</div>
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<div class="line"><span class="lineno"> 31</span> uint32_t iters = 0;</div>
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<div class="line"><span class="lineno"> 32</span> <span class="keywordtype">double</span> c, d;</div>
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<div class="line"><span class="lineno"> 33</span> <span class="keywordtype">double</span> prev_mean, mean = <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/numeric_limits/infinity.html">std::numeric_limits<double>::infinity</a>();</div>
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<div class="line"><span class="lineno"> 34</span> </div>
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<div class="line"><span class="lineno"> 35</span> <span class="comment">// golden ratio value</span></div>
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<div class="line"><span class="lineno"> 36</span> <span class="keyword">const</span> <span class="keywordtype">double</span> M_GOLDEN_RATIO = (1.f + <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/math/sqrt.html">std::sqrt</a>(5.f)) / 2.f;</div>
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<div class="line"><span class="lineno"> 37</span> </div>
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<div class="line"><span class="lineno"> 38</span> <span class="comment">// ensure that lim_a < lim_b</span></div>
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<div class="line"><span class="lineno"> 39</span> <span class="keywordflow">if</span> (lim_a > lim_b) {</div>
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<div class="line"><span class="lineno"> 40</span> <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/swap.html">std::swap</a>(lim_a, lim_b);</div>
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<div class="line"><span class="lineno"> 41</span> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (std::abs(lim_a - lim_b) <= <a class="code hl_define" href="#a002b2f4894492820fe708b1b7e7c5e70">EPSILON</a>) {</div>
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<div class="line"><span class="lineno"> 42</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cerr</a> << <span class="stringliteral">"Search range must be greater than "</span> << <a class="code hl_define" href="#a002b2f4894492820fe708b1b7e7c5e70">EPSILON</a> << <span class="stringliteral">"\n"</span>;</div>
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<div class="line"><span class="lineno"> 43</span> <span class="keywordflow">return</span> lim_a;</div>
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<div class="line"><span class="lineno"> 44</span> }</div>
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<div class="line"><span class="lineno"> 45</span> </div>
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<div class="line"><span class="lineno"> 46</span> <span class="keywordflow">do</span> {</div>
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<div class="line"><span class="lineno"> 47</span> prev_mean = mean;</div>
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<div class="line"><span class="lineno"> 48</span> </div>
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<div class="line"><span class="lineno"> 49</span> <span class="comment">// compute the section ratio width</span></div>
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<div class="line"><span class="lineno"> 50</span> <span class="keywordtype">double</span> ratio = (lim_b - lim_a) / M_GOLDEN_RATIO;</div>
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<div class="line"><span class="lineno"> 51</span> c = lim_b - ratio; <span class="comment">// right-side section start</span></div>
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<div class="line"><span class="lineno"> 52</span> d = lim_a + ratio; <span class="comment">// left-side section end</span></div>
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<div class="line"><span class="lineno"> 53</span> </div>
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<div class="line"><span class="lineno"> 54</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="../../d4/d18/composite__simpson__rule_8cpp.html#a4251b4df4748a0b9c43a48f61bdd2397">f</a>(c) < <a class="code hl_function" href="../../d4/d18/composite__simpson__rule_8cpp.html#a4251b4df4748a0b9c43a48f61bdd2397">f</a>(d)) {</div>
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<div class="line"><span class="lineno"> 55</span> <span class="comment">// select left section</span></div>
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<div class="line"><span class="lineno"> 56</span> lim_b = d;</div>
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<div class="line"><span class="lineno"> 57</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><span class="lineno"> 58</span> <span class="comment">// selct right section</span></div>
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<div class="line"><span class="lineno"> 59</span> lim_a = c;</div>
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<div class="line"><span class="lineno"> 60</span> }</div>
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<div class="line"><span class="lineno"> 61</span> </div>
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<div class="line"><span class="lineno"> 62</span> mean = (lim_a + lim_b) / 2.f;</div>
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<div class="line"><span class="lineno"> 63</span> iters++;</div>
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<div class="line"><span class="lineno"> 64</span> </div>
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<div class="line"><span class="lineno"> 65</span> <span class="comment">// continue till the interval width is greater than sqrt(system epsilon)</span></div>
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<div class="line"><span class="lineno"> 66</span> } <span class="keywordflow">while</span> (std::abs(lim_a - lim_b) > <a class="code hl_define" href="#a002b2f4894492820fe708b1b7e7c5e70">EPSILON</a>);</div>
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<div class="line"><span class="lineno"> 67</span> </div>
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<div class="line"><span class="lineno"> 68</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">" (iters: "</span> << iters << <span class="stringliteral">") "</span>;</div>
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<div class="line"><span class="lineno"> 69</span> <span class="keywordflow">return</span> prev_mean;</div>
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<div class="line"><span class="lineno"> 70</span>}</div>
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<div class="ttc" id="abasic_ostream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cerr</a></div></div>
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<div class="ttc" id="acomposite__simpson__rule_8cpp_html_a4251b4df4748a0b9c43a48f61bdd2397"><div class="ttname"><a href="../../d4/d18/composite__simpson__rule_8cpp.html#a4251b4df4748a0b9c43a48f61bdd2397">numerical_methods::simpson_method::f</a></div><div class="ttdeci">double f(double x)</div><div class="ttdoc">A function f(x) that will be used to test the method.</div><div class="ttdef"><b>Definition</b> composite_simpson_rule.cpp:113</div></div>
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<div class="ttc" id="agolden__search__extrema_8cpp_html_a002b2f4894492820fe708b1b7e7c5e70"><div class="ttname"><a href="#a002b2f4894492820fe708b1b7e7c5e70">EPSILON</a></div><div class="ttdeci">#define EPSILON</div><div class="ttdoc">solution accuracy limit</div><div class="ttdef"><b>Definition</b> golden_search_extrema.cpp:17</div></div>
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<div class="ttc" id="ainfinity_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/numeric_limits/infinity.html">std::numeric_limits::infinity</a></div><div class="ttdeci">T infinity(T... args)</div></div>
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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>
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<div class="ttc" id="aswap_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/algorithm/swap.html">std::swap</a></div><div class="ttdeci">T swap(T... args)</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">◆ </a></span>main()</h2>
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<td class="memname">int main </td>
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<p>Main function </p>
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<div class="fragment"><div class="line"><span class="lineno"> 139</span> {</div>
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<div class="line"><span class="lineno"> 140</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a>.precision(9);</div>
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<div class="line"><span class="lineno"> 141</span> </div>
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<div class="line"><span class="lineno"> 142</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Computations performed with machine epsilon: "</span> << <a class="code hl_define" href="#a002b2f4894492820fe708b1b7e7c5e70">EPSILON</a></div>
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<div class="line"><span class="lineno"> 143</span> << <span class="stringliteral">"\n"</span>;</div>
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<div class="line"><span class="lineno"> 144</span> </div>
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<div class="line"><span class="lineno"> 145</span> <a class="code hl_function" href="#a1440a7779ac56f47a3f355ce4a8c7da0">test1</a>();</div>
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<div class="line"><span class="lineno"> 146</span> <a class="code hl_function" href="#a0283886819c7c140a023582b7269e2d0">test2</a>();</div>
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<div class="line"><span class="lineno"> 147</span> <a class="code hl_function" href="#a6d0455dd5c30adda100e95f0423c786e">test3</a>();</div>
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<div class="line"><span class="lineno"> 148</span> </div>
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<div class="line"><span class="lineno"> 149</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 150</span>}</div>
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<div class="ttc" id="agolden__search__extrema_8cpp_html_a0283886819c7c140a023582b7269e2d0"><div class="ttname"><a href="#a0283886819c7c140a023582b7269e2d0">test2</a></div><div class="ttdeci">void test2()</div><div class="ttdoc">Test function to find maxima for the function in the interval Expected result: .</div><div class="ttdef"><b>Definition</b> golden_search_extrema.cpp:100</div></div>
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<div class="ttc" id="agolden__search__extrema_8cpp_html_a1440a7779ac56f47a3f355ce4a8c7da0"><div class="ttname"><a href="#a1440a7779ac56f47a3f355ce4a8c7da0">test1</a></div><div class="ttdeci">void test1()</div><div class="ttdoc">Test function to find minima for the function in the interval Expected result = 2.</div><div class="ttdef"><b>Definition</b> golden_search_extrema.cpp:78</div></div>
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<div class="ttc" id="agolden__search__extrema_8cpp_html_a6d0455dd5c30adda100e95f0423c786e"><div class="ttname"><a href="#a6d0455dd5c30adda100e95f0423c786e">test3</a></div><div class="ttdeci">void test3()</div><div class="ttdoc">Test function to find maxima for the function in the interval Expected result: .</div><div class="ttdef"><b>Definition</b> golden_search_extrema.cpp:123</div></div>
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<a id="a1440a7779ac56f47a3f355ce4a8c7da0" name="a1440a7779ac56f47a3f355ce4a8c7da0"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a1440a7779ac56f47a3f355ce4a8c7da0">◆ </a></span>test1()</h2>
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<td class="memname">void test1 </td>
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<p>Test function to find minima for the function \(f(x)= (x-2)^2\) in the interval \([1,5]\) <br />
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Expected result = 2. </p>
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<div class="fragment"><div class="line"><span class="lineno"> 78</span> {</div>
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<div class="line"><span class="lineno"> 79</span> <span class="comment">// define the function to minimize as a lambda function</span></div>
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<div class="line"><span class="lineno"> 80</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/functional/function.html">std::function</a><double(<span class="keywordtype">double</span>)> f1 = [](<span class="keywordtype">double</span> x) {</div>
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<div class="line"><span class="lineno"> 81</span> <span class="keywordflow">return</span> (x - 2) * (x - 2);</div>
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<div class="line"><span class="lineno"> 82</span> };</div>
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<div class="line"><span class="lineno"> 83</span> </div>
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<div class="line"><span class="lineno"> 84</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Test 1.... "</span>;</div>
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<div class="line"><span class="lineno"> 85</span> </div>
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<div class="line"><span class="lineno"> 86</span> <span class="keywordtype">double</span> minima = <a class="code hl_function" href="#a1aa76a6d5fd4d333f9072beff1dc486b">get_minima</a>(f1, 1, 5);</div>
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<div class="line"><span class="lineno"> 87</span> </div>
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<div class="line"><span class="lineno"> 88</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << minima << <span class="stringliteral">"..."</span>;</div>
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<div class="line"><span class="lineno"> 89</span> </div>
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<div class="line"><span class="lineno"> 90</span> assert(std::abs(minima - 2) < <a class="code hl_define" href="#a002b2f4894492820fe708b1b7e7c5e70">EPSILON</a>);</div>
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<div class="line"><span class="lineno"> 91</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed\n"</span>;</div>
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<div class="line"><span class="lineno"> 92</span>}</div>
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<div class="ttc" id="afunction_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/functional/function.html">std::function</a></div></div>
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<div class="ttc" id="agolden__search__extrema_8cpp_html_a1aa76a6d5fd4d333f9072beff1dc486b"><div class="ttname"><a href="#a1aa76a6d5fd4d333f9072beff1dc486b">get_minima</a></div><div class="ttdeci">double get_minima(const std::function< double(double)> &f, double lim_a, double lim_b)</div><div class="ttdoc">Get the minima of a function in the given interval. To get the maxima, simply negate the function....</div><div class="ttdef"><b>Definition</b> golden_search_extrema.cpp:29</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a0283886819c7c140a023582b7269e2d0">◆ </a></span>test2()</h2>
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<p>Test function to find <em>maxima</em> for the function \(f(x)= x^{\frac{1}{x}}\) in the interval \([-2,10]\) <br />
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Expected result: \(e\approx 2.71828182845904509\). </p>
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<div class="fragment"><div class="line"><span class="lineno"> 100</span> {</div>
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<div class="line"><span class="lineno"> 101</span> <span class="comment">// define the function to maximize as a lambda function</span></div>
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<div class="line"><span class="lineno"> 102</span> <span class="comment">// since we are maximixing, we negated the function return value</span></div>
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<div class="line"><span class="lineno"> 103</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/functional/function.html">std::function</a><double(<span class="keywordtype">double</span>)> func = [](<span class="keywordtype">double</span> x) {</div>
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<div class="line"><span class="lineno"> 104</span> <span class="keywordflow">return</span> -<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/math/pow.html">std::pow</a>(x, 1.f / x);</div>
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<div class="line"><span class="lineno"> 105</span> };</div>
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<div class="line"><span class="lineno"> 106</span> </div>
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<div class="line"><span class="lineno"> 107</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Test 2.... "</span>;</div>
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<div class="line"><span class="lineno"> 108</span> </div>
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<div class="line"><span class="lineno"> 109</span> <span class="keywordtype">double</span> minima = <a class="code hl_function" href="#a1aa76a6d5fd4d333f9072beff1dc486b">get_minima</a>(func, -2, 10);</div>
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<div class="line"><span class="lineno"> 110</span> </div>
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<div class="line"><span class="lineno"> 111</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << minima << <span class="stringliteral">" ("</span> << M_E << <span class="stringliteral">")..."</span>;</div>
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<div class="line"><span class="lineno"> 112</span> </div>
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<div class="line"><span class="lineno"> 113</span> assert(std::abs(minima - M_E) < <a class="code hl_define" href="#a002b2f4894492820fe708b1b7e7c5e70">EPSILON</a>);</div>
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<div class="line"><span class="lineno"> 114</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed\n"</span>;</div>
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<div class="line"><span class="lineno"> 115</span>}</div>
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<div class="ttc" id="apow_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/numeric/math/pow.html">std::pow</a></div><div class="ttdeci">T pow(T... args)</div></div>
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<div class="center"><iframe scrolling="no" frameborder="0" src="../../d6/d7a/golden__search__extrema_8cpp_a0283886819c7c140a023582b7269e2d0_cgraph.svg" width="378" height="151"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a6d0455dd5c30adda100e95f0423c786e">◆ </a></span>test3()</h2>
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<p>Test function to find <em>maxima</em> for the function \(f(x)= \cos x\) in the interval \([0,12]\) <br />
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Expected result: \(\pi\approx 3.14159265358979312\). </p>
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<div class="fragment"><div class="line"><span class="lineno"> 123</span> {</div>
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<div class="line"><span class="lineno"> 124</span> <span class="comment">// define the function to maximize as a lambda function</span></div>
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<div class="line"><span class="lineno"> 125</span> <span class="comment">// since we are maximixing, we negated the function return value</span></div>
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<div class="line"><span class="lineno"> 126</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/functional/function.html">std::function</a><double(<span class="keywordtype">double</span>)> func = [](<span class="keywordtype">double</span> x) { <span class="keywordflow">return</span> <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/numeric/math/cos.html">std::cos</a>(x); };</div>
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<div class="line"><span class="lineno"> 127</span> </div>
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<div class="line"><span class="lineno"> 128</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Test 3.... "</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> <span class="keywordtype">double</span> minima = <a class="code hl_function" href="#a1aa76a6d5fd4d333f9072beff1dc486b">get_minima</a>(func, -4, 12);</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> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << minima << <span class="stringliteral">" ("</span> << M_PI << <span class="stringliteral">")..."</span>;</div>
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<div class="line"><span class="lineno"> 133</span> </div>
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<div class="line"><span class="lineno"> 134</span> assert(std::abs(minima - M_PI) < <a class="code hl_define" href="#a002b2f4894492820fe708b1b7e7c5e70">EPSILON</a>);</div>
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<div class="line"><span class="lineno"> 135</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed\n"</span>;</div>
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<div class="line"><span class="lineno"> 136</span>}</div>
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<div class="ttc" id="acos_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/numeric/math/cos.html">std::cos</a></div><div class="ttdeci">T cos(T... args)</div></div>
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