Python matplotlib plotting after date

Question

I am having an issue plotting after a date has been plotted. the code is the following:

import matplotlib.pyplot as plt

from matplotlib import style

x = [735412.0, 735503.0, 735594.0, 735685.0]

y =['0.0', '16961000000.0', '29030000000.0', '32504000000.0']

z = ['100000', '200000000000', '3000000000000', '400000000000']



# plt.plot_date(x, y, marker='o', linestyle='-', color='b')

plt.plot(y,z) # this does not print if above line is uncommented

plt.gcf().autofmt_xdate() # turns bottom dates at angle

plt.show()

What am I doing wrong? Thanks! L

You don't have any dates to plot. I believe plot_date() will expect the first argument to be a list of datetime objects. — Scott
– Scott, Commented Jun 1, 2015 at 3:32
@Scott, no, the numbers in x are interpreted somehow as dates (hours since some reference or so, I am sure). — j08lue
– j08lue, Commented Jun 1, 2015 at 11:18

j08lue · Accepted Answer · 2015-06-01 11:26:34Z

1

First of all, your "numbers" in y are actually strings. You would need to convert them to float using np.array(y, float) to use them on an axis.

But did you really intend to plt.plot(y,z) in the same figure as the others? The values in y are not dates/times of any kind, so probably not.

I suspect this should be a new figure, so you need to start a new figure with plt.figure() before you plot y vs z:

plt.figure()
plt.plot(y,z)

and drop the plt.gcf().autofmt_xdate() after that.

answered Jun 1, 2015 at 11:26

j08lue

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2 Comments

FuckYouAll Over a year ago

THanks all, it looks like it makes no difference whether y is a list of strings of floats, they can be plotted individually with no problem. What I am trying to accomplish is to plot overlapping lines on the same figure like the following:x = [1,2,3] y = [2,3,4] z = [5,4,3] plt.plot(x,y) plt.plot(x,z) plt.show()

j08lue Over a year ago

In that case you just have typo (y,z instead of the correct x,z).

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