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<title>api example code: barchart_demo.py — Matplotlib 1.3.0 documentation</title>
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<div class="section" id="api-example-code-barchart-demo-py">
<span id="api-barchart-demo"></span><h1>api example code: barchart_demo.py<a class="headerlink" href="#api-example-code-barchart-demo-py" title="Permalink to this headline">¶</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/api/barchart_demo.py">Source code</a>, <a class="reference external" href="../../mpl_examples/api/barchart_demo.png">png</a>, <a class="reference external" href="../../mpl_examples/api/barchart_demo.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/api/barchart_demo.pdf">pdf</a>)</p>
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<img alt="../../_images/barchart_demo.png" src="../../_images/barchart_demo.png" />
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<div class="highlight-python"><div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="c"># a bar plot with errorbars</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
<span class="n">N</span> <span class="o">=</span> <span class="mi">5</span>
<span class="n">menMeans</span> <span class="o">=</span> <span class="p">(</span><span class="mi">20</span><span class="p">,</span> <span class="mi">35</span><span class="p">,</span> <span class="mi">30</span><span class="p">,</span> <span class="mi">35</span><span class="p">,</span> <span class="mi">27</span><span class="p">)</span>
<span class="n">menStd</span> <span class="o">=</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">ind</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="n">N</span><span class="p">)</span> <span class="c"># the x locations for the groups</span>
<span class="n">width</span> <span class="o">=</span> <span class="mf">0.35</span> <span class="c"># the width of the bars</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">subplots</span><span class="p">()</span>
<span class="n">rects1</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">bar</span><span class="p">(</span><span class="n">ind</span><span class="p">,</span> <span class="n">menMeans</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s">'r'</span><span class="p">,</span> <span class="n">yerr</span><span class="o">=</span><span class="n">menStd</span><span class="p">)</span>
<span class="n">womenMeans</span> <span class="o">=</span> <span class="p">(</span><span class="mi">25</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">34</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">25</span><span class="p">)</span>
<span class="n">womenStd</span> <span class="o">=</span> <span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
<span class="n">rects2</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">bar</span><span class="p">(</span><span class="n">ind</span><span class="o">+</span><span class="n">width</span><span class="p">,</span> <span class="n">womenMeans</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s">'y'</span><span class="p">,</span> <span class="n">yerr</span><span class="o">=</span><span class="n">womenStd</span><span class="p">)</span>
<span class="c"># add some</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_ylabel</span><span class="p">(</span><span class="s">'Scores'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_title</span><span class="p">(</span><span class="s">'Scores by group and gender'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xticks</span><span class="p">(</span><span class="n">ind</span><span class="o">+</span><span class="n">width</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xticklabels</span><span class="p">(</span> <span class="p">(</span><span class="s">'G1'</span><span class="p">,</span> <span class="s">'G2'</span><span class="p">,</span> <span class="s">'G3'</span><span class="p">,</span> <span class="s">'G4'</span><span class="p">,</span> <span class="s">'G5'</span><span class="p">)</span> <span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">legend</span><span class="p">(</span> <span class="p">(</span><span class="n">rects1</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">rects2</span><span class="p">[</span><span class="mi">0</span><span class="p">]),</span> <span class="p">(</span><span class="s">'Men'</span><span class="p">,</span> <span class="s">'Women'</span><span class="p">)</span> <span class="p">)</span>
<span class="k">def</span> <span class="nf">autolabel</span><span class="p">(</span><span class="n">rects</span><span class="p">):</span>
<span class="c"># attach some text labels</span>
<span class="k">for</span> <span class="n">rect</span> <span class="ow">in</span> <span class="n">rects</span><span class="p">:</span>
<span class="n">height</span> <span class="o">=</span> <span class="n">rect</span><span class="o">.</span><span class="n">get_height</span><span class="p">()</span>
<span class="n">ax</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">rect</span><span class="o">.</span><span class="n">get_x</span><span class="p">()</span><span class="o">+</span><span class="n">rect</span><span class="o">.</span><span class="n">get_width</span><span class="p">()</span><span class="o">/</span><span class="mf">2.</span><span class="p">,</span> <span class="mf">1.05</span><span class="o">*</span><span class="n">height</span><span class="p">,</span> <span class="s">'</span><span class="si">%d</span><span class="s">'</span><span class="o">%</span><span class="nb">int</span><span class="p">(</span><span class="n">height</span><span class="p">),</span>
<span class="n">ha</span><span class="o">=</span><span class="s">'center'</span><span class="p">,</span> <span class="n">va</span><span class="o">=</span><span class="s">'bottom'</span><span class="p">)</span>
<span class="n">autolabel</span><span class="p">(</span><span class="n">rects1</span><span class="p">)</span>
<span class="n">autolabel</span><span class="p">(</span><span class="n">rects2</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
</pre></div>
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<p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><em>Search examples</em></a>)</p>
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