.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/lines_bars_and_markers/stackplot_demo.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. meta::
        :keywords: codex

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_gallery_lines_bars_and_markers_stackplot_demo.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_lines_bars_and_markers_stackplot_demo.py:


===========================
Stackplots and streamgraphs
===========================

.. GENERATED FROM PYTHON SOURCE LINES 8-14

Stackplots
----------

Stackplots draw multiple datasets as vertically stacked areas. This is
useful when the individual data values and additionally their cumulative
value are of interest.

.. GENERATED FROM PYTHON SOURCE LINES 14-44

.. code-block:: Python



    import matplotlib.pyplot as plt
    import numpy as np

    import matplotlib.ticker as mticker

    # data from United Nations World Population Prospects (Revision 2019)
    # https://population.un.org/wpp/, license: CC BY 3.0 IGO
    year = [1950, 1960, 1970, 1980, 1990, 2000, 2010, 2018]
    population_by_continent = {
        'Africa': [.228, .284, .365, .477, .631, .814, 1.044, 1.275],
        'the Americas': [.340, .425, .519, .619, .727, .840, .943, 1.006],
        'Asia': [1.394, 1.686, 2.120, 2.625, 3.202, 3.714, 4.169, 4.560],
        'Europe': [.220, .253, .276, .295, .310, .303, .294, .293],
        'Oceania': [.012, .015, .019, .022, .026, .031, .036, .039],
    }

    fig, ax = plt.subplots()
    ax.stackplot(year, population_by_continent.values(),
                 labels=population_by_continent.keys(), alpha=0.8)
    ax.legend(loc='upper left', reverse=True)
    ax.set_title('World population')
    ax.set_xlabel('Year')
    ax.set_ylabel('Number of people (billions)')
    # add tick at every 200 million people
    ax.yaxis.set_minor_locator(mticker.MultipleLocator(.2))

    plt.show()




.. image-sg:: /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_001.png
   :alt: World population
   :srcset: /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_001.png, /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_001_2_00x.png 2.00x
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 45-50

Streamgraphs
------------

Using the *baseline* parameter, you can turn an ordinary stacked area plot
with baseline 0 into a stream graph.

.. GENERATED FROM PYTHON SOURCE LINES 50-77

.. code-block:: Python



    # Fixing random state for reproducibility
    np.random.seed(19680801)


    def gaussian_mixture(x, n=5):
        """Return a random mixture of *n* Gaussians, evaluated at positions *x*."""
        def add_random_gaussian(a):
            amplitude = 1 / (.1 + np.random.random())
            dx = x[-1] - x[0]
            x0 = (2 * np.random.random() - .5) * dx
            z = 10 / (.1 + np.random.random()) / dx
            a += amplitude * np.exp(-(z * (x - x0))**2)
        a = np.zeros_like(x)
        for j in range(n):
            add_random_gaussian(a)
        return a


    x = np.linspace(0, 100, 101)
    ys = [gaussian_mixture(x) for _ in range(3)]

    fig, ax = plt.subplots()
    ax.stackplot(x, ys, baseline='wiggle')
    plt.show()




.. image-sg:: /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_002.png
   :alt: stackplot demo
   :srcset: /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_002.png, /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_002_2_00x.png 2.00x
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 78-82

.. tags::

   plot-type: stackplot
   level: intermediate


.. _sphx_glr_download_gallery_lines_bars_and_markers_stackplot_demo.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: stackplot_demo.ipynb <stackplot_demo.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: stackplot_demo.py <stackplot_demo.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: stackplot_demo.zip <stackplot_demo.zip>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_