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<div class="section" id="first-examples">
<span id="example"></span><h1>First examples<a class="headerlink" href="#first-examples" title="Permalink to this headline">¶</a></h1>
<div class="section" id="minimal-working-example">
<h2>Minimal working example<a class="headerlink" href="#minimal-working-example" title="Permalink to this headline">¶</a></h2>
<div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span> <span class="cpf">"matplotlibcpp.h"</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><vector></span><span class="cp"></span>
<span class="k">namespace</span> <span class="n">plt</span> <span class="o">=</span> <span class="n">matplotlibcpp</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span> <span class="n">y</span> <span class="o">=</span> <span class="p">{</span><span class="mi">1</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">};</span>
<span class="n">plt</span><span class="o">::</span><span class="n">plot</span><span class="p">(</span><span class="n">y</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">savefig</span><span class="p">(</span><span class="s">"minimal.pdf"</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<p>produces the output</p>
<img alt="_images/minimal.pdf" src="_images/minimal.pdf" />
</div>
<div class="section" id="standard-usage">
<h2>Standard usage<a class="headerlink" href="#standard-usage" title="Permalink to this headline">¶</a></h2>
<div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#define _USE_MATH_DEFINES </span><span class="c1">// for sin/log</span>
<span class="cp">#include</span> <span class="cpf">"../matplotlibcpp.h"</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><cmath></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><iostream></span><span class="cp"></span>
<span class="k">namespace</span> <span class="n">plt</span> <span class="o">=</span> <span class="n">matplotlibcpp</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">n</span> <span class="o">=</span> <span class="mi">5000</span><span class="p">;</span> <span class="c1">// 5000 data points</span>
<span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span> <span class="n">x</span><span class="p">(</span><span class="n">n</span><span class="p">),</span> <span class="n">y</span><span class="p">(</span><span class="n">n</span><span class="p">),</span> <span class="n">z</span><span class="p">(</span><span class="n">n</span><span class="p">),</span> <span class="n">w</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="mi">2</span><span class="p">);</span>
<span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">n</span><span class="p">;</span> <span class="o">++</span><span class="n">i</span><span class="p">)</span> <span class="p">{</span>
<span class="n">x</span><span class="p">.</span><span class="n">at</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="o">=</span> <span class="n">i</span> <span class="o">*</span> <span class="n">i</span><span class="p">;</span>
<span class="n">y</span><span class="p">.</span><span class="n">at</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="o">=</span> <span class="n">sin</span><span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">M_PI</span> <span class="o">*</span> <span class="n">i</span> <span class="o">/</span> <span class="mf">360.0</span><span class="p">);</span>
<span class="n">z</span><span class="p">.</span><span class="n">at</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="o">=</span> <span class="n">log</span><span class="p">(</span><span class="n">i</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">plt</span><span class="o">::</span><span class="n">figure</span><span class="p">();</span> <span class="c1">// declare a new figure (optional if only one is used)</span>
<span class="n">plt</span><span class="o">::</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">);</span> <span class="c1">// automatic coloring: tab:blue</span>
<span class="n">plt</span><span class="o">::</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">w</span><span class="p">,</span> <span class="s">"r--"</span><span class="p">);</span> <span class="c1">// red dashed line</span>
<span class="n">plt</span><span class="o">::</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">z</span><span class="p">,</span> <span class="p">{{</span><span class="s">"label"</span><span class="p">,</span> <span class="s">"log(x)"</span><span class="p">}});</span> <span class="c1">// legend label "log(x)"</span>
<span class="n">plt</span><span class="o">::</span><span class="n">xlim</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1000</span> <span class="o">*</span> <span class="mi">1000</span><span class="p">);</span> <span class="c1">// x-axis interval: [0, 1e6]</span>
<span class="n">plt</span><span class="o">::</span><span class="n">title</span><span class="p">(</span><span class="s">"Standard usage"</span><span class="p">);</span> <span class="c1">// set a title</span>
<span class="n">plt</span><span class="o">::</span><span class="n">legend</span><span class="p">();</span> <span class="c1">// enable the legend</span>
<span class="n">plt</span><span class="o">::</span><span class="n">savefig</span><span class="p">(</span><span class="s">"standard.pdf"</span><span class="p">);</span> <span class="c1">// save the figure</span>
<span class="p">}</span>
</pre></div>
</div>
<p>produces the output</p>
<img alt="_images/standard.pdf" src="_images/standard.pdf" />
</div>
<div class="section" id="eigen-vectors">
<h2>Eigen vectors<a class="headerlink" href="#eigen-vectors" title="Permalink to this headline">¶</a></h2>
<div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span> <span class="cpf">"../../matplotlibcpp.h"</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><Eigen/Dense></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><iostream></span><span class="cp"></span>
<span class="k">namespace</span> <span class="n">plt</span> <span class="o">=</span> <span class="n">matplotlibcpp</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
<span class="n">Eigen</span><span class="o">::</span><span class="n">VectorXd</span> <span class="n">x</span> <span class="o">=</span> <span class="n">Eigen</span><span class="o">::</span><span class="n">VectorXd</span><span class="o">::</span><span class="n">LinSpaced</span><span class="p">(</span><span class="mi">200</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">6</span><span class="p">);</span>
<span class="n">Eigen</span><span class="o">::</span><span class="n">VectorXd</span> <span class="n">y</span><span class="p">,</span> <span class="n">z</span><span class="p">;</span>
<span class="c1">// y = exp(sin(x)), z = exp(cos(z))</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">x</span><span class="p">.</span><span class="n">array</span><span class="p">().</span><span class="n">sin</span><span class="p">().</span><span class="n">exp</span><span class="p">().</span><span class="n">matrix</span><span class="p">();</span>
<span class="n">z</span> <span class="o">=</span> <span class="n">x</span><span class="p">.</span><span class="n">array</span><span class="p">().</span><span class="n">cos</span><span class="p">().</span><span class="n">exp</span><span class="p">().</span><span class="n">matrix</span><span class="p">();</span>
<span class="n">plt</span><span class="o">::</span><span class="n">figure</span><span class="p">();</span>
<span class="n">plt</span><span class="o">::</span><span class="n">semilogx</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="s">"tab:red"</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">semilogx</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">z</span><span class="p">,</span> <span class="s">"tab:blue"</span><span class="p">,</span> <span class="p">{{</span><span class="s">"linestyle"</span><span class="p">,</span> <span class="s">"--"</span><span class="p">}});</span>
<span class="n">plt</span><span class="o">::</span><span class="n">xlabel</span><span class="p">(</span><span class="s">"Time in lecture"</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">ylabel</span><span class="p">(</span><span class="s">"Student confusion"</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">grid</span><span class="p">();</span>
<span class="n">plt</span><span class="o">::</span><span class="n">savefig</span><span class="p">(</span><span class="s">"eigen.pdf"</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">show</span><span class="p">();</span> <span class="c1">// show the figure instead of saving it</span>
<span class="p">}</span>
</pre></div>
</div>
<p>produces the output</p>
<img alt="_images/eigen.pdf" src="_images/eigen.pdf" />
</div>
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