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<span id="api-sankey-demo-basics"></span><h1>api example code: sankey_demo_basics.py<a class="headerlink" href="#api-example-code-sankey-demo-basics-py" title="Permalink to this headline">¶</a></h1>
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<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""Demonstrate the Sankey class by producing three basic diagrams.</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">from</span> <span class="nn">matplotlib.sankey</span> <span class="kn">import</span> <span class="n">Sankey</span>
<span class="c"># Example 1 -- Mostly defaults</span>
<span class="c"># This demonstrates how to create a simple diagram by implicitly calling the</span>
<span class="c"># Sankey.add() method and by appending finish() to the call to the class.</span>
<span class="n">Sankey</span><span class="p">(</span><span class="n">flows</span><span class="o">=</span><span class="p">[</span><span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.15</span><span class="p">,</span> <span class="mf">0.60</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.20</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.05</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.50</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.10</span><span class="p">],</span>
<span class="n">labels</span><span class="o">=</span><span class="p">[</span><span class="s">''</span><span class="p">,</span> <span class="s">''</span><span class="p">,</span> <span class="s">''</span><span class="p">,</span> <span class="s">'First'</span><span class="p">,</span> <span class="s">'Second'</span><span class="p">,</span> <span class="s">'Third'</span><span class="p">,</span> <span class="s">'Fourth'</span><span class="p">,</span> <span class="s">'Fifth'</span><span class="p">],</span>
<span class="n">orientations</span><span class="o">=</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</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="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">])</span><span class="o">.</span><span class="n">finish</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">title</span><span class="p">(</span><span class="s">"The default settings produce a diagram like this."</span><span class="p">)</span>
<span class="c"># Notice:</span>
<span class="c"># 1. Axes weren't provided when Sankey() was instantiated, so they were</span>
<span class="c"># created automatically.</span>
<span class="c"># 2. The scale argument wasn't necessary since the data was already</span>
<span class="c"># normalized.</span>
<span class="c"># 3. By default, the lengths of the paths are justified.</span>
<span class="c"># Example 2</span>
<span class="c"># This demonstrates:</span>
<span class="c"># 1. Setting one path longer than the others</span>
<span class="c"># 2. Placing a label in the middle of the diagram</span>
<span class="c"># 3. Using the the scale argument to normalize the flows</span>
<span class="c"># 4. Implicitly passing keyword arguments to PathPatch()</span>
<span class="c"># 5. Changing the angle of the arrow heads</span>
<span class="c"># 6. Changing the offset between the tips of the paths and their labels</span>
<span class="c"># 7. Formatting the numbers in the path labels and the associated unit</span>
<span class="c"># 8. Changing the appearance of the patch and the labels after the figure is</span>
<span class="c"># created</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">ax</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">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">xticks</span><span class="o">=</span><span class="p">[],</span> <span class="n">yticks</span><span class="o">=</span><span class="p">[],</span>
<span class="n">title</span><span class="o">=</span><span class="s">"Flow Diagram of a Widget"</span><span class="p">)</span>
<span class="n">sankey</span> <span class="o">=</span> <span class="n">Sankey</span><span class="p">(</span><span class="n">ax</span><span class="o">=</span><span class="n">ax</span><span class="p">,</span> <span class="n">scale</span><span class="o">=</span><span class="mf">0.01</span><span class="p">,</span> <span class="n">offset</span><span class="o">=</span><span class="mf">0.2</span><span class="p">,</span> <span class="n">head_angle</span><span class="o">=</span><span class="mi">180</span><span class="p">,</span>
<span class="n">format</span><span class="o">=</span><span class="s">'</span><span class="si">%.0f</span><span class="s">'</span><span class="p">,</span> <span class="n">unit</span><span class="o">=</span><span class="s">'%'</span><span class="p">)</span>
<span class="n">sankey</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">flows</span><span class="o">=</span><span class="p">[</span><span class="mi">25</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="o">-</span><span class="mi">10</span><span class="p">,</span> <span class="o">-</span><span class="mi">20</span><span class="p">,</span> <span class="o">-</span><span class="mi">5</span><span class="p">,</span> <span class="o">-</span><span class="mi">15</span><span class="p">,</span> <span class="o">-</span><span class="mi">10</span><span class="p">,</span> <span class="o">-</span><span class="mi">40</span><span class="p">],</span>
<span class="n">labels</span> <span class="o">=</span> <span class="p">[</span><span class="s">''</span><span class="p">,</span> <span class="s">''</span><span class="p">,</span> <span class="s">''</span><span class="p">,</span> <span class="s">'First'</span><span class="p">,</span> <span class="s">'Second'</span><span class="p">,</span> <span class="s">'Third'</span><span class="p">,</span> <span class="s">'Fourth'</span><span class="p">,</span>
<span class="s">'Fifth'</span><span class="p">,</span> <span class="s">'Hurray!'</span><span class="p">],</span>
<span class="n">orientations</span><span class="o">=</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</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="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">],</span>
<span class="n">pathlengths</span> <span class="o">=</span> <span class="p">[</span><span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.6</span><span class="p">,</span> <span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.25</span><span class="p">,</span>
<span class="mf">0.25</span><span class="p">],</span>
<span class="n">patchlabel</span><span class="o">=</span><span class="s">"Widget</span><span class="se">\n</span><span class="s">A"</span><span class="p">,</span>
<span class="n">alpha</span><span class="o">=</span><span class="mf">0.2</span><span class="p">,</span> <span class="n">lw</span><span class="o">=</span><span class="mf">2.0</span><span class="p">)</span> <span class="c"># Arguments to matplotlib.patches.PathPatch()</span>
<span class="n">diagrams</span> <span class="o">=</span> <span class="n">sankey</span><span class="o">.</span><span class="n">finish</span><span class="p">()</span>
<span class="n">diagrams</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">patch</span><span class="o">.</span><span class="n">set_facecolor</span><span class="p">(</span><span class="s">'#37c959'</span><span class="p">)</span>
<span class="n">diagrams</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">texts</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">set_color</span><span class="p">(</span><span class="s">'r'</span><span class="p">)</span>
<span class="n">diagrams</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">text</span><span class="o">.</span><span class="n">set_fontweight</span><span class="p">(</span><span class="s">'bold'</span><span class="p">)</span>
<span class="c"># Notice:</span>
<span class="c"># 1. Since the sum of the flows is nonzero, the width of the trunk isn't</span>
<span class="c"># uniform. If verbose.level is helpful (in matplotlibrc), a message is</span>
<span class="c"># given in the terminal window.</span>
<span class="c"># 2. The second flow doesn't appear because its value is zero. Again, if</span>
<span class="c"># verbose.level is helpful, a message is given in the terminal window.</span>
<span class="c"># Example 3</span>
<span class="c"># This demonstrates:</span>
<span class="c"># 1. Connecting two systems</span>
<span class="c"># 2. Turning off the labels of the quantities</span>
<span class="c"># 3. Adding a legend</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">ax</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">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">xticks</span><span class="o">=</span><span class="p">[],</span> <span class="n">yticks</span><span class="o">=</span><span class="p">[],</span> <span class="n">title</span><span class="o">=</span><span class="s">"Two Systems"</span><span class="p">)</span>
<span class="n">flows</span> <span class="o">=</span> <span class="p">[</span><span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.15</span><span class="p">,</span> <span class="mf">0.60</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.10</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.05</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.25</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.15</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.10</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.35</span><span class="p">]</span>
<span class="n">sankey</span> <span class="o">=</span> <span class="n">Sankey</span><span class="p">(</span><span class="n">ax</span><span class="o">=</span><span class="n">ax</span><span class="p">,</span> <span class="n">unit</span><span class="o">=</span><span class="bp">None</span><span class="p">)</span>
<span class="n">sankey</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">flows</span><span class="o">=</span><span class="n">flows</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s">'one'</span><span class="p">,</span>
<span class="n">orientations</span><span class="o">=</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</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="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">])</span>
<span class="n">sankey</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">flows</span><span class="o">=</span><span class="p">[</span><span class="o">-</span><span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.15</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">],</span> <span class="n">fc</span><span class="o">=</span><span class="s">'#37c959'</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s">'two'</span><span class="p">,</span>
<span class="n">orientations</span><span class="o">=</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">prior</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">connect</span><span class="o">=</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</span>
<span class="n">diagrams</span> <span class="o">=</span> <span class="n">sankey</span><span class="o">.</span><span class="n">finish</span><span class="p">()</span>
<span class="n">diagrams</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">patch</span><span class="o">.</span><span class="n">set_hatch</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">legend</span><span class="p">(</span><span class="n">loc</span><span class="o">=</span><span class="s">'best'</span><span class="p">)</span>
<span class="c"># Notice that only one connection is specified, but the systems form a</span>
<span class="c"># circuit since: (1) the lengths of the paths are justified and (2) the</span>
<span class="c"># orientation and ordering of the flows is mirrored.</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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