

.. _sphx_glr_gallery_pylab_examples_eventcollection_demo.py:


====================
EventCollection Demo
====================

Plot two curves, then use EventCollections to mark the locations of the x
and y data points on the respective axes for each curve




.. image:: /gallery/pylab_examples/images/sphx_glr_eventcollection_demo_001.png
    :align: center





.. code-block:: python


    import matplotlib.pyplot as plt
    from matplotlib.collections import EventCollection
    import numpy as np

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

    # create random data
    xdata = np.random.random([2, 10])

    # split the data into two parts
    xdata1 = xdata[0, :]
    xdata2 = xdata[1, :]

    # sort the data so it makes clean curves
    xdata1.sort()
    xdata2.sort()

    # create some y data points
    ydata1 = xdata1 ** 2
    ydata2 = 1 - xdata2 ** 3

    # plot the data
    fig = plt.figure()
    ax = fig.add_subplot(1, 1, 1)
    ax.plot(xdata1, ydata1, 'r', xdata2, ydata2, 'b')

    # create the events marking the x data points
    xevents1 = EventCollection(xdata1, color=[1, 0, 0], linelength=0.05)
    xevents2 = EventCollection(xdata2, color=[0, 0, 1], linelength=0.05)

    # create the events marking the y data points
    yevents1 = EventCollection(ydata1, color=[1, 0, 0], linelength=0.05,
                               orientation='vertical')
    yevents2 = EventCollection(ydata2, color=[0, 0, 1], linelength=0.05,
                               orientation='vertical')

    # add the events to the axis
    ax.add_collection(xevents1)
    ax.add_collection(xevents2)
    ax.add_collection(yevents1)
    ax.add_collection(yevents2)

    # set the limits
    ax.set_xlim([0, 1])
    ax.set_ylim([0, 1])

    ax.set_title('line plot with data points')

    # display the plot
    plt.show()

**Total running time of the script:** ( 0 minutes  0.027 seconds)



.. container:: sphx-glr-footer


  .. container:: sphx-glr-download

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



  .. container:: sphx-glr-download

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

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

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