CODEWITHSUNDEEP
pythondatetimeplot
shn
shn

Reputation: 5266

How to plot a datetime in Python?

I have a list of numbers Z, a list Z_means (which is a list of means of the numbers in Z using a moving average, and it has not the same len as Z), and another list P of the same len as Z_means.

I have the following two plots:

pylab.figure(00);
pylab.plot(range(len(Z)), Z, 'go',         [i for i in range(len(Z_means))], Z_means)

pylab.figure(11);
pylab.plot( [i for i in range(len(P))], P)

I have a list of dates D = [d0, d1, d2, ...] each date is of type datetime.datetime.

How can I do these plots using those dates instead of the i values (on the x axis) ? The i'th value correspond to the i'th date in D.

Note that I want just the month and year to appear on the plot (not the whole date)

Upvotes: 2

Views: 1742

Answers (1)

or1426
or1426

Reputation: 949

I suggest using the matplotlib plot_date method to plot the data along with the matplotlib.dates.DateFormatter to put only the month and year on the x-axis.

Here is a (pretty minimal) working example:

import datetime
import matplotlib.pyplot as plt
from matplotlib.dates import DayLocator, HourLocator, DateFormatter, drange
import numpy as np

date1 = datetime.datetime( 2000, 3, 2)
date2 = datetime.datetime( 2001, 10, 10)
delta = datetime.timedelta(days=28)
dates = drange(date1, date2, delta)

ys = np.arange( len(dates) )

fig, ax = plt.subplots()

ax.plot_date(dates, ys*ys)

ax.xaxis.set_major_formatter( DateFormatter('%Y-%m') )

plt.show()

Upvotes: 1

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