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

.. only:: html

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

        Click :ref:`here <sphx_glr_download_gallery_text_labels_and_annotations_date_index_formatter.py>`
        to download the full example code

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

.. _sphx_glr_gallery_text_labels_and_annotations_date_index_formatter.py:


=====================================
Custom tick formatter for time series
=====================================

When plotting time series, e.g., financial time series, one often wants
to leave out days on which there is no data, i.e. weekends.  The example
below shows how to use an 'index formatter' to achieve the desired plot

.. GENERATED FROM PYTHON SOURCE LINES 10-46

.. code-block:: default

    import numpy as np
    import matplotlib.pyplot as plt
    import matplotlib.cbook as cbook

    # Load a numpy record array from yahoo csv data with fields date, open, close,
    # volume, adj_close from the mpl-data/example directory. The record array
    # stores the date as an np.datetime64 with a day unit ('D') in the date column.
    r = (cbook.get_sample_data('goog.npz', np_load=True)['price_data']
         .view(np.recarray))
    r = r[-30:]  # get the last 30 days

    # first we'll do it the default way, with gaps on weekends
    fig, (ax1, ax2) = plt.subplots(ncols=2, figsize=(8, 4))
    ax1.plot(r.date, r.adj_close, 'o-')
    ax1.set_title("Default")
    fig.autofmt_xdate()

    # next we'll write a custom formatter
    N = len(r)
    ind = np.arange(N)  # the evenly spaced plot indices


    def format_date(x, pos=None):
        thisind = np.clip(int(x + 0.5), 0, N - 1)
        return r.date[thisind].item().strftime('%Y-%m-%d')


    ax2.plot(ind, r.adj_close, 'o-')
    # Use automatic FuncFormatter creation
    ax2.xaxis.set_major_formatter(format_date)
    ax2.set_title("Custom tick formatter")
    fig.autofmt_xdate()

    plt.show()





.. image:: /gallery/text_labels_and_annotations/images/sphx_glr_date_index_formatter_001.png
    :alt: Default, Custom tick formatter
    :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 47-56

.. admonition:: References

   The use of the following functions, methods, classes and modules is shown
   in this example:

   - `matplotlib.pyplot.subplots`
   - `matplotlib.axis.Axis.set_major_formatter`
   - `matplotlib.cbook.get_sample_data`
   - `matplotlib.ticker.FuncFormatter`


.. _sphx_glr_download_gallery_text_labels_and_annotations_date_index_formatter.py:


.. only :: html

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



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

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



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

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


.. only:: html

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

    Keywords: matplotlib code example, codex, python plot, pyplot
    `Gallery generated by Sphinx-Gallery
    <https://sphinx-gallery.readthedocs.io>`_