Using a Pandas dataframe index as values for x-axis in matplotlib plot

Question

I have time series in a Pandas dateframe with a number of columns which I’d like to plot. Is there a way to set the x-axis to always use the index from a dateframe?
When I use the .plot() method from Pandas the x-axis is formatted correctly however I when I pass my dates and the column(s) I’d like to plot directly to matplotlib the graph doesn’t plot correctly. Thanks in advance.

plt.plot(site2.index.values, site2['Cl'])
plt.show()

output

FYI: site2.index.values produces this (I’ve cut out the middle part for brevity):

array([
    '1987-07-25T12:30:00.000000000+0200',
    '1987-07-25T16:30:00.000000000+0200',
    '2010-08-13T02:00:00.000000000+0200',
    '2010-08-31T02:00:00.000000000+0200',
    '2010-09-15T02:00:00.000000000+0200'
], 
dtype='datetime64[ns]')

Asked By: Jason

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Source

Answer 1

You can use plt.xticks to set the x-axis

try:

plt.xticks( site2['Cl'], site2.index.values ) # location, labels
plt.plot( site2['Cl'] )
plt.show()

see the documentation for more details: http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.xticks

Answered By: Higgs

Answer 2

It seems the issue was that I had .values. Without it (i.e. site2.index) the graph displays correctly.

Answered By: Jason

Answer 3

That’s Builtin Right Into To plot() method

You can use yourDataFrame.plot(use_index=True) to use the DataFrame Index On X-Axis.

The "use_index=True" sets the DataFrame Index on the X-Axis.

Read More Here: https://pandas.pydata.org/pandas-docs/version/0.23/generated/pandas.DataFrame.plot.html

Answered By: Anonymous Atom

Using a Pandas dataframe index as values for x-axis in matplotlib plot

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