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<div class="section" id="pylab-examples-example-code-barchart-demo2-py">
<span id="pylab-examples-barchart-demo2"></span><h1>pylab_examples example code: barchart_demo2.py<a class="headerlink" href="#pylab-examples-example-code-barchart-demo2-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/pylab_examples/barchart_demo2.py">Source code</a>)</p>
<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""</span>
<span class="sd">Thanks Josh Hemann for the example</span>
<span class="sd">This examples comes from an application in which grade school gym</span>
<span class="sd">teachers wanted to be able to show parents how their child did across</span>
<span class="sd">a handful of fitness tests, and importantly, relative to how other</span>
<span class="sd">children did. To extract the plotting code for demo purposes, we'll</span>
<span class="sd">just make up some data for little Johnny Doe...</span>
<span class="sd">"""</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="kn">import</span> <span class="nn">pylab</span>
<span class="kn">from</span> <span class="nn">matplotlib.patches</span> <span class="kn">import</span> <span class="n">Polygon</span>
<span class="kn">from</span> <span class="nn">matplotlib.ticker</span> <span class="kn">import</span> <span class="n">MaxNLocator</span>
<span class="n">student</span> <span class="o">=</span> <span class="s">'Johnny Doe'</span>
<span class="n">grade</span> <span class="o">=</span> <span class="mi">2</span>
<span class="n">gender</span> <span class="o">=</span> <span class="s">'boy'</span>
<span class="n">cohortSize</span> <span class="o">=</span> <span class="mi">62</span> <span class="c">#The number of other 2nd grade boys</span>
<span class="n">numTests</span> <span class="o">=</span> <span class="mi">5</span>
<span class="n">testNames</span> <span class="o">=</span> <span class="p">[</span><span class="s">'Pacer Test'</span><span class="p">,</span> <span class="s">'Flexed Arm</span><span class="se">\n</span><span class="s"> Hang'</span><span class="p">,</span> <span class="s">'Mile Run'</span><span class="p">,</span> <span class="s">'Agility'</span><span class="p">,</span>
<span class="s">'Push Ups'</span><span class="p">]</span>
<span class="n">testMeta</span> <span class="o">=</span> <span class="p">[</span><span class="s">'laps'</span><span class="p">,</span> <span class="s">'sec'</span><span class="p">,</span> <span class="s">'min:sec'</span><span class="p">,</span> <span class="s">'sec'</span><span class="p">,</span> <span class="s">''</span><span class="p">]</span>
<span class="n">scores</span> <span class="o">=</span> <span class="p">[</span><span class="s">'7'</span><span class="p">,</span> <span class="s">'48'</span><span class="p">,</span> <span class="s">'12:52'</span><span class="p">,</span> <span class="s">'17'</span><span class="p">,</span> <span class="s">'14'</span><span class="p">]</span>
<span class="n">rankings</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">round</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">numTests</span><span class="p">)</span><span class="o">*</span><span class="mi">100</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">(</span><span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">9</span><span class="p">,</span><span class="mi">7</span><span class="p">))</span>
<span class="n">ax1</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">111</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">subplots_adjust</span><span class="p">(</span><span class="n">left</span><span class="o">=</span><span class="mf">0.115</span><span class="p">,</span> <span class="n">right</span><span class="o">=</span><span class="mf">0.88</span><span class="p">)</span>
<span class="n">fig</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">set_window_title</span><span class="p">(</span><span class="s">'Eldorado K-8 Fitness Chart'</span><span class="p">)</span>
<span class="n">pos</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">numTests</span><span class="p">)</span><span class="o">+</span><span class="mf">0.5</span> <span class="c">#Center bars on the Y-axis ticks</span>
<span class="n">rects</span> <span class="o">=</span> <span class="n">ax1</span><span class="o">.</span><span class="n">barh</span><span class="p">(</span><span class="n">pos</span><span class="p">,</span> <span class="n">rankings</span><span class="p">,</span> <span class="n">align</span><span class="o">=</span><span class="s">'center'</span><span class="p">,</span> <span class="n">height</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s">'m'</span><span class="p">)</span>
<span class="n">ax1</span><span class="o">.</span><span class="n">axis</span><span class="p">([</span><span class="mi">0</span><span class="p">,</span><span class="mi">100</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">5</span><span class="p">])</span>
<span class="n">pylab</span><span class="o">.</span><span class="n">yticks</span><span class="p">(</span><span class="n">pos</span><span class="p">,</span> <span class="n">testNames</span><span class="p">)</span>
<span class="n">ax1</span><span class="o">.</span><span class="n">set_title</span><span class="p">(</span><span class="s">'Johnny Doe'</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="mi">50</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.5</span><span class="p">,</span> <span class="s">'Cohort Size: '</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">cohortSize</span><span class="p">),</span>
<span class="n">horizontalalignment</span><span class="o">=</span><span class="s">'center'</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="s">'small'</span><span class="p">)</span>
<span class="c"># Set the right-hand Y-axis ticks and labels and set X-axis tick marks at the</span>
<span class="c"># deciles</span>
<span class="n">ax2</span> <span class="o">=</span> <span class="n">ax1</span><span class="o">.</span><span class="n">twinx</span><span class="p">()</span>
<span class="n">ax2</span><span class="o">.</span><span class="n">plot</span><span class="p">([</span><span class="mi">100</span><span class="p">,</span><span class="mi">100</span><span class="p">],</span> <span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">5</span><span class="p">],</span> <span class="s">'white'</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.1</span><span class="p">)</span>
<span class="n">ax2</span><span class="o">.</span><span class="n">xaxis</span><span class="o">.</span><span class="n">set_major_locator</span><span class="p">(</span><span class="n">MaxNLocator</span><span class="p">(</span><span class="mi">11</span><span class="p">))</span>
<span class="n">xticks</span> <span class="o">=</span> <span class="n">pylab</span><span class="o">.</span><span class="n">setp</span><span class="p">(</span><span class="n">ax2</span><span class="p">,</span> <span class="n">xticklabels</span><span class="o">=</span><span class="p">[</span><span class="s">'0'</span><span class="p">,</span><span class="s">'10'</span><span class="p">,</span><span class="s">'20'</span><span class="p">,</span><span class="s">'30'</span><span class="p">,</span><span class="s">'40'</span><span class="p">,</span><span class="s">'50'</span><span class="p">,</span><span class="s">'60'</span><span class="p">,</span>
<span class="s">'70'</span><span class="p">,</span>
<span class="s">'80'</span><span class="p">,</span><span class="s">'90'</span><span class="p">,</span><span class="s">'100'</span><span class="p">])</span>
<span class="n">ax2</span><span class="o">.</span><span class="n">xaxis</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="bp">True</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s">'--'</span><span class="p">,</span> <span class="n">which</span><span class="o">=</span><span class="s">'major'</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s">'grey'</span><span class="p">,</span>
<span class="n">alpha</span><span class="o">=</span><span class="mf">0.25</span><span class="p">)</span>
<span class="c">#Plot a solid vertical gridline to highlight the median position</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">([</span><span class="mi">50</span><span class="p">,</span><span class="mi">50</span><span class="p">],</span> <span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">5</span><span class="p">],</span> <span class="s">'grey'</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.25</span><span class="p">)</span>
<span class="c"># Build up the score labels for the right Y-axis by first appending a carriage</span>
<span class="c"># return to each string and then tacking on the appropriate meta information</span>
<span class="c"># (i.e., 'laps' vs 'seconds'). We want the labels centered on the ticks, so if</span>
<span class="c"># there is no meta info (like for pushups) then don't add the carriage return to</span>
<span class="c"># the string</span>
<span class="k">def</span> <span class="nf">withnew</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">scr</span><span class="p">):</span>
<span class="k">if</span> <span class="n">testMeta</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">!=</span> <span class="s">''</span> <span class="p">:</span> <span class="k">return</span> <span class="s">'</span><span class="si">%s</span><span class="se">\n</span><span class="s">'</span><span class="o">%</span><span class="n">scr</span>
<span class="k">else</span><span class="p">:</span> <span class="k">return</span> <span class="n">scr</span>
<span class="n">scoreLabels</span> <span class="o">=</span> <span class="p">[</span><span class="n">withnew</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">scr</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span><span class="n">scr</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">scores</span><span class="p">)]</span>
<span class="n">scoreLabels</span> <span class="o">=</span> <span class="p">[</span><span class="n">i</span><span class="o">+</span><span class="n">j</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span><span class="n">j</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">scoreLabels</span><span class="p">,</span> <span class="n">testMeta</span><span class="p">)]</span>
<span class="n">pylab</span><span class="o">.</span><span class="n">yticks</span><span class="p">(</span><span class="n">pos</span><span class="p">,</span> <span class="n">scoreLabels</span><span class="p">)</span>
<span class="n">ax2</span><span class="o">.</span><span class="n">set_ylabel</span><span class="p">(</span><span class="s">'Test Scores'</span><span class="p">)</span>
<span class="c">#Make list of numerical suffixes corresponding to position in a list</span>
<span class="c"># 0 1 2 3 4 5 6 7 8 9</span>
<span class="n">suffixes</span> <span class="o">=</span><span class="p">[</span><span class="s">'th'</span><span class="p">,</span> <span class="s">'st'</span><span class="p">,</span> <span class="s">'nd'</span><span class="p">,</span> <span class="s">'rd'</span><span class="p">,</span> <span class="s">'th'</span><span class="p">,</span> <span class="s">'th'</span><span class="p">,</span> <span class="s">'th'</span><span class="p">,</span> <span class="s">'th'</span><span class="p">,</span> <span class="s">'th'</span><span class="p">,</span> <span class="s">'th'</span><span class="p">]</span>
<span class="n">ax2</span><span class="o">.</span><span class="n">set_xlabel</span><span class="p">(</span><span class="s">'Percentile Ranking Across '</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">grade</span><span class="p">)</span> <span class="o">+</span> <span class="n">suffixes</span><span class="p">[</span><span class="n">grade</span><span class="p">]</span> \
<span class="o">+</span> <span class="s">' Grade '</span> <span class="o">+</span> <span class="n">gender</span><span class="o">.</span><span class="n">title</span><span class="p">()</span> <span class="o">+</span> <span class="s">'s'</span><span class="p">)</span>
<span class="c"># Lastly, write in the ranking inside each bar to aid in interpretation</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="c"># Rectangle widths are already integer-valued but are floating</span>
<span class="c"># type, so it helps to remove the trailing decimal point and 0 by</span>
<span class="c"># converting width to int type</span>
<span class="n">width</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">rect</span><span class="o">.</span><span class="n">get_width</span><span class="p">())</span>
<span class="c"># Figure out what the last digit (width modulo 10) so we can add</span>
<span class="c"># the appropriate numerical suffix (e.g. 1st, 2nd, 3rd, etc)</span>
<span class="n">lastDigit</span> <span class="o">=</span> <span class="n">width</span> <span class="o">%</span> <span class="mi">10</span>
<span class="c"># Note that 11, 12, and 13 are special cases</span>
<span class="k">if</span> <span class="p">(</span><span class="n">width</span> <span class="o">==</span> <span class="mi">11</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="n">width</span> <span class="o">==</span> <span class="mi">12</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="n">width</span> <span class="o">==</span> <span class="mi">13</span><span class="p">):</span>
<span class="n">suffix</span> <span class="o">=</span> <span class="s">'th'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">suffix</span> <span class="o">=</span> <span class="n">suffixes</span><span class="p">[</span><span class="n">lastDigit</span><span class="p">]</span>
<span class="n">rankStr</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">width</span><span class="p">)</span> <span class="o">+</span> <span class="n">suffix</span>
<span class="k">if</span> <span class="p">(</span><span class="n">width</span> <span class="o"><</span> <span class="mi">5</span><span class="p">):</span> <span class="c"># The bars aren't wide enough to print the ranking inside</span>
<span class="n">xloc</span> <span class="o">=</span> <span class="n">width</span> <span class="o">+</span> <span class="mi">1</span> <span class="c"># Shift the text to the right side of the right edge</span>
<span class="n">clr</span> <span class="o">=</span> <span class="s">'black'</span> <span class="c"># Black against white background</span>
<span class="n">align</span> <span class="o">=</span> <span class="s">'left'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">xloc</span> <span class="o">=</span> <span class="mf">0.98</span><span class="o">*</span><span class="n">width</span> <span class="c"># Shift the text to the left side of the right edge</span>
<span class="n">clr</span> <span class="o">=</span> <span class="s">'white'</span> <span class="c"># White on magenta</span>
<span class="n">align</span> <span class="o">=</span> <span class="s">'right'</span>
<span class="n">yloc</span> <span class="o">=</span> <span class="n">rect</span><span class="o">.</span><span class="n">get_y</span><span class="p">()</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="o">/</span><span class="mf">2.0</span> <span class="c">#Center the text vertically in the bar</span>
<span class="n">ax1</span><span class="o">.</span><span class="n">text</span><span class="p">(</span><span class="n">xloc</span><span class="p">,</span> <span class="n">yloc</span><span class="p">,</span> <span class="n">rankStr</span><span class="p">,</span> <span class="n">horizontalalignment</span><span class="o">=</span><span class="n">align</span><span class="p">,</span>
<span class="n">verticalalignment</span><span class="o">=</span><span class="s">'center'</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="n">clr</span><span class="p">,</span> <span class="n">weight</span><span class="o">=</span><span class="s">'bold'</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
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