.. only:: html

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

        Click :ref:`here <sphx_glr_download_gallery_ticks_and_spines_date_index_formatter2.py>`     to download the full example code
    .. rst-class:: sphx-glr-example-title

    .. _sphx_glr_gallery_ticks_and_spines_date_index_formatter2.py:


====================
Date Index Formatter
====================

When plotting daily data, a frequent request is to plot the data
ignoring skips, e.g., no extra spaces for weekends.  This is particularly
common in financial time series, when you may have data for M-F and
not Sat, Sun and you don't want gaps in the x axis.  The approach is
to simply use the integer index for the xdata and a custom tick
Formatter to get the appropriate date string for a given index.



.. image:: /gallery/ticks_and_spines/images/sphx_glr_date_index_formatter2_001.png
    :alt: date index formatter2
    :class: sphx-glr-single-img


.. rst-class:: sphx-glr-script-out

 Out:

 .. code-block:: none

    loading /usr/local/lib/python3.8/site-packages/matplotlib/mpl-data/sample_data/msft.csv






|


.. code-block:: default


    import dateutil.parser
    from matplotlib import cbook, dates
    import matplotlib.pyplot as plt
    from matplotlib.ticker import Formatter
    import numpy as np


    datafile = cbook.get_sample_data('msft.csv', asfileobj=False)
    print('loading %s' % datafile)
    msft_data = np.genfromtxt(
        datafile, delimiter=',', names=True,
        converters={0: lambda s: dates.date2num(dateutil.parser.parse(s))})


    class MyFormatter(Formatter):
        def __init__(self, dates, fmt='%Y-%m-%d'):
            self.dates = dates
            self.fmt = fmt

        def __call__(self, x, pos=0):
            """Return the label for time x at position pos."""
            ind = int(round(x))
            if ind >= len(self.dates) or ind < 0:
                return ''
            return dates.num2date(self.dates[ind]).strftime(self.fmt)


    fig, ax = plt.subplots()
    ax.xaxis.set_major_formatter(MyFormatter(msft_data['Date']))
    ax.plot(msft_data['Close'], 'o-')
    fig.autofmt_xdate()
    plt.show()


.. _sphx_glr_download_gallery_ticks_and_spines_date_index_formatter2.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_formatter2.py <date_index_formatter2.py>`



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

     :download:`Download Jupyter notebook: date_index_formatter2.ipynb <date_index_formatter2.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>`_