

.. _sphx_glr_gallery_lines_bars_and_markers_stackplot_demo.py:


==============
Stackplot Demo
==============

How to create stackplots with Matplotlib.

Stackplots are generated by plotting different datasets vertically on
top of one another rather than overlapping with one another. Below we
show some examples to accomplish this with Matplotlib.



.. code-block:: python

    import numpy as np
    import matplotlib.pyplot as plt

    x = [1, 2, 3, 4, 5]
    y1 = [1, 1, 2, 3, 5]
    y2 = [0, 4, 2, 6, 8]
    y3 = [1, 3, 5, 7, 9]

    y = np.vstack([y1, y2, y3])

    labels = ["Fibonacci ", "Evens", "Odds"]

    fig, ax = plt.subplots()
    ax.stackplot(x, y1, y2, y3, labels=labels)
    ax.legend(loc=2)
    plt.show()

    fig, ax = plt.subplots()
    ax.stackplot(x, y)
    plt.show()




.. rst-class:: sphx-glr-horizontal


    *

      .. image:: /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_001.png
            :scale: 47

    *

      .. image:: /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_002.png
            :scale: 47




Here we show an example of making a streamgraph using stackplot



.. code-block:: python



    def layers(n, m):
        """
        Return *n* random Gaussian mixtures, each of length *m*.
        """
        def bump(a):
            x = 1 / (.1 + np.random.random())
            y = 2 * np.random.random() - .5
            z = 10 / (.1 + np.random.random())
            for i in range(m):
                w = (i / float(m) - y) * z
                a[i] += x * np.exp(-w * w)
        a = np.zeros((m, n))
        for i in range(n):
            for j in range(5):
                bump(a[:, i])
        return a


    d = layers(3, 100)

    fig, ax = plt.subplots()
    ax.stackplot(range(100), d.T, baseline='wiggle')
    plt.show()



.. image:: /gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_003.png
    :align: center




**Total running time of the script:** ( 0 minutes  0.186 seconds)



.. only :: html

 .. container:: sphx-glr-footer


  .. container:: sphx-glr-download

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



  .. container:: sphx-glr-download

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


.. only:: html

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

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