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<h1>Source code for matplotlib.stackplot</h1><div class="highlight"><pre>
<span></span><span class="sd">"""</span>
<span class="sd">Stacked area plot for 1D arrays inspired by Douglas Y'barbo's stackoverflow</span>
<span class="sd">answer:</span>
<span class="sd">http://stackoverflow.com/questions/2225995/how-can-i-create-stacked-line-graph-with-matplotlib</span>
<span class="sd">(http://stackoverflow.com/users/66549/doug)</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="kn">from</span> <span class="nn">matplotlib</span> <span class="kn">import</span> <span class="n">_api</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'stackplot'</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">stackplot</span><span class="p">(</span><span class="n">axes</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span>
<span class="n">labels</span><span class="o">=</span><span class="p">(),</span> <span class="n">colors</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">baseline</span><span class="o">=</span><span class="s1">'zero'</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Draw a stacked area plot.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> x : (N,) array-like</span>
<span class="sd"> y : (M, N) array-like</span>
<span class="sd"> The data is assumed to be unstacked. Each of the following</span>
<span class="sd"> calls is legal::</span>
<span class="sd"> stackplot(x, y) # where y has shape (M, N)</span>
<span class="sd"> stackplot(x, y1, y2, y3) # where y1, y2, y3, y4 have length N</span>
<span class="sd"> baseline : {'zero', 'sym', 'wiggle', 'weighted_wiggle'}</span>
<span class="sd"> Method used to calculate the baseline:</span>
<span class="sd"> - ``'zero'``: Constant zero baseline, i.e. a simple stacked plot.</span>
<span class="sd"> - ``'sym'``: Symmetric around zero and is sometimes called</span>
<span class="sd"> 'ThemeRiver'.</span>
<span class="sd"> - ``'wiggle'``: Minimizes the sum of the squared slopes.</span>
<span class="sd"> - ``'weighted_wiggle'``: Does the same but weights to account for</span>
<span class="sd"> size of each layer. It is also called 'Streamgraph'-layout. More</span>
<span class="sd"> details can be found at http://leebyron.com/streamgraph/.</span>
<span class="sd"> labels : list of str, optional</span>
<span class="sd"> A sequence of labels to assign to each data series. If unspecified,</span>
<span class="sd"> then no labels will be applied to artists.</span>
<span class="sd"> colors : list of color, optional</span>
<span class="sd"> A sequence of colors to be cycled through and used to color the stacked</span>
<span class="sd"> areas. The sequence need not be exactly the same length as the number</span>
<span class="sd"> of provided *y*, in which case the colors will repeat from the</span>
<span class="sd"> beginning.</span>
<span class="sd"> If not specified, the colors from the Axes property cycle will be used.</span>
<span class="sd"> **kwargs</span>
<span class="sd"> All other keyword arguments are passed to `.Axes.fill_between`.</span>
<span class="sd"> Returns</span>
<span class="sd"> -------</span>
<span class="sd"> list of `.PolyCollection`</span>
<span class="sd"> A list of `.PolyCollection` instances, one for each element in the</span>
<span class="sd"> stacked area plot.</span>
<span class="sd"> """</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">row_stack</span><span class="p">(</span><span class="n">args</span><span class="p">)</span>
<span class="n">labels</span> <span class="o">=</span> <span class="nb">iter</span><span class="p">(</span><span class="n">labels</span><span class="p">)</span>
<span class="k">if</span> <span class="n">colors</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">axes</span><span class="o">.</span><span class="n">set_prop_cycle</span><span class="p">(</span><span class="n">color</span><span class="o">=</span><span class="n">colors</span><span class="p">)</span>
<span class="c1"># Assume data passed has not been 'stacked', so stack it here.</span>
<span class="c1"># We'll need a float buffer for the upcoming calculations.</span>
<span class="n">stack</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">cumsum</span><span class="p">(</span><span class="n">y</span><span class="p">,</span> <span class="n">axis</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">dtype</span><span class="o">=</span><span class="n">np</span><span class="o">.</span><span class="n">promote_types</span><span class="p">(</span><span class="n">y</span><span class="o">.</span><span class="n">dtype</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">float32</span><span class="p">))</span>
<span class="n">_api</span><span class="o">.</span><span class="n">check_in_list</span><span class="p">([</span><span class="s1">'zero'</span><span class="p">,</span> <span class="s1">'sym'</span><span class="p">,</span> <span class="s1">'wiggle'</span><span class="p">,</span> <span class="s1">'weighted_wiggle'</span><span class="p">],</span>
<span class="n">baseline</span><span class="o">=</span><span class="n">baseline</span><span class="p">)</span>
<span class="k">if</span> <span class="n">baseline</span> <span class="o">==</span> <span class="s1">'zero'</span><span class="p">:</span>
<span class="n">first_line</span> <span class="o">=</span> <span class="mf">0.</span>
<span class="k">elif</span> <span class="n">baseline</span> <span class="o">==</span> <span class="s1">'sym'</span><span class="p">:</span>
<span class="n">first_line</span> <span class="o">=</span> <span class="o">-</span><span class="n">np</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">y</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="o">*</span> <span class="mf">0.5</span>
<span class="n">stack</span> <span class="o">+=</span> <span class="n">first_line</span><span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="p">:]</span>
<span class="k">elif</span> <span class="n">baseline</span> <span class="o">==</span> <span class="s1">'wiggle'</span><span class="p">:</span>
<span class="n">m</span> <span class="o">=</span> <span class="n">y</span><span class="o">.</span><span class="n">shape</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">first_line</span> <span class="o">=</span> <span class="p">(</span><span class="n">y</span> <span class="o">*</span> <span class="p">(</span><span class="n">m</span> <span class="o">-</span> <span class="mf">0.5</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">m</span><span class="p">)[:,</span> <span class="kc">None</span><span class="p">]))</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">first_line</span> <span class="o">/=</span> <span class="o">-</span><span class="n">m</span>
<span class="n">stack</span> <span class="o">+=</span> <span class="n">first_line</span>
<span class="k">elif</span> <span class="n">baseline</span> <span class="o">==</span> <span class="s1">'weighted_wiggle'</span><span class="p">:</span>
<span class="n">total</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">y</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="c1"># multiply by 1/total (or zero) to avoid infinities in the division:</span>
<span class="n">inv_total</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros_like</span><span class="p">(</span><span class="n">total</span><span class="p">)</span>
<span class="n">mask</span> <span class="o">=</span> <span class="n">total</span> <span class="o">></span> <span class="mi">0</span>
<span class="n">inv_total</span><span class="p">[</span><span class="n">mask</span><span class="p">]</span> <span class="o">=</span> <span class="mf">1.0</span> <span class="o">/</span> <span class="n">total</span><span class="p">[</span><span class="n">mask</span><span class="p">]</span>
<span class="n">increase</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">hstack</span><span class="p">((</span><span class="n">y</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">np</span><span class="o">.</span><span class="n">diff</span><span class="p">(</span><span class="n">y</span><span class="p">)))</span>
<span class="n">below_size</span> <span class="o">=</span> <span class="n">total</span> <span class="o">-</span> <span class="n">stack</span>
<span class="n">below_size</span> <span class="o">+=</span> <span class="mf">0.5</span> <span class="o">*</span> <span class="n">y</span>
<span class="n">move_up</span> <span class="o">=</span> <span class="n">below_size</span> <span class="o">*</span> <span class="n">inv_total</span>
<span class="n">move_up</span><span class="p">[:,</span> <span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="mf">0.5</span>
<span class="n">center</span> <span class="o">=</span> <span class="p">(</span><span class="n">move_up</span> <span class="o">-</span> <span class="mf">0.5</span><span class="p">)</span> <span class="o">*</span> <span class="n">increase</span>
<span class="n">center</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">cumsum</span><span class="p">(</span><span class="n">center</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="mi">0</span><span class="p">))</span>
<span class="n">first_line</span> <span class="o">=</span> <span class="n">center</span> <span class="o">-</span> <span class="mf">0.5</span> <span class="o">*</span> <span class="n">total</span>
<span class="n">stack</span> <span class="o">+=</span> <span class="n">first_line</span>
<span class="c1"># Color between x = 0 and the first array.</span>
<span class="n">color</span> <span class="o">=</span> <span class="n">axes</span><span class="o">.</span><span class="n">_get_lines</span><span class="o">.</span><span class="n">get_next_color</span><span class="p">()</span>
<span class="n">coll</span> <span class="o">=</span> <span class="n">axes</span><span class="o">.</span><span class="n">fill_between</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">first_line</span><span class="p">,</span> <span class="n">stack</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="p">:],</span>
<span class="n">facecolor</span><span class="o">=</span><span class="n">color</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="nb">next</span><span class="p">(</span><span class="n">labels</span><span class="p">,</span> <span class="kc">None</span><span class="p">),</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="n">coll</span><span class="o">.</span><span class="n">sticky_edges</span><span class="o">.</span><span class="n">y</span><span class="p">[:]</span> <span class="o">=</span> <span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">r</span> <span class="o">=</span> <span class="p">[</span><span class="n">coll</span><span class="p">]</span>
<span class="c1"># Color between array i-1 and array i</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">y</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span><span class="p">):</span>
<span class="n">color</span> <span class="o">=</span> <span class="n">axes</span><span class="o">.</span><span class="n">_get_lines</span><span class="o">.</span><span class="n">get_next_color</span><span class="p">()</span>
<span class="n">r</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">axes</span><span class="o">.</span><span class="n">fill_between</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">stack</span><span class="p">[</span><span class="n">i</span><span class="p">,</span> <span class="p">:],</span> <span class="n">stack</span><span class="p">[</span><span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">,</span> <span class="p">:],</span>
<span class="n">facecolor</span><span class="o">=</span><span class="n">color</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="nb">next</span><span class="p">(</span><span class="n">labels</span><span class="p">,</span> <span class="kc">None</span><span class="p">),</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">))</span>
<span class="k">return</span> <span class="n">r</span>
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