matplotlib with dates

Question

I'm trying to plot values as a function of the date (only hh:mm:ss, without dd/mm/yy). The code looks like this

dates = matplotlib.dates.date2num(x_values)
plt.plot_date(dates, y_values)

but I get the following error

'numpy.string_' object has no attribute 'toordinal'.

Joe Kington · Accepted Answer · 2012-06-18 23:01:53Z

16

date2num expects datetime objects. If you have strings, use matplotlib.dates.datestr2num.

answered Jun 18, 2012 at 23:01

Joe Kington

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Mark · Accepted Answer · 2012-06-18 23:01:59Z

2

According to the docs:

matplotlib.dates.date2num(d): d is either a datetime instance or a sequence of datetimes.

Looks like you are giving in a string.

answered Jun 18, 2012 at 23:01

Mark

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Comments

Chris Fender · Accepted Answer · 2018-01-25 12:19:50Z

0

from matplotlib import pyplot as plt <br>
pay_date=['2016-04-30', '2016-06-28', '2016-11-29'] 
due_date=['2016-05-02', '2016-07-31', '2016-10-29'] 
plt.plot_date(pay_date,due_date,xdate=True,ydate=True)

Just add the parameters xdate=True and ydate=True and it will automatically plot the dates

and finally write the following code, to print the lines

plt.plot(pay_date,due_date)

edited Jan 25, 2018 at 12:19

Chris Fender

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answered Mar 9, 2017 at 15:17

Storm

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