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Cannot plot bar chart with DatetimeIndex #9613

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JohnsonY1995 opened this issue Oct 29, 2017 · 4 comments
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Cannot plot bar chart with DatetimeIndex #9613

JohnsonY1995 opened this issue Oct 29, 2017 · 4 comments
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third-party integration topic: units and array ducktypes
Milestone
v2.2.0

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@JohnsonY1995
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Bug report

Bug summary

matplotlib.pyplot.bar unable to use pandas.core.indexes.datetimes.DatetimeIndex as x

Code for reproduction

import datetime as dt
import matplotlib.pyplot as plt
from matplotlib import style
import pandas_datareader.data as web
style.use('ggplot')

start = dt.datetime(2017,10,1)
end = dt.datetime(2017,10,28)
df = web.DataReader('AAPL', 'yahoo', start, end)
ax1 = plt.subplot2grid((6,1), (0,0), rowspan=5, colspan=1)
ax2 = plt.subplot2grid((6,1), (5,0), rowspan=1, colspan=1, sharex=ax1)
ax1.plot(df.index, df['Adj Close'])
ax2.bar(df.index, df['Volume'])
plt.show()

Output

Traceback (most recent call last):
  File "C:/Users/x/x/x/test.py", line 13, in <module>
    ax2.bar(df.index, df['Volume'])
  File "C:\Users\Johnson\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\__init__.py", line 1710, in inner
    return func(ax, *args, **kwargs)
  File "C:\Users\Johnson\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\axes\_axes.py", line 2129, in bar
    left = x - width / 2
TypeError: ufunc subtract cannot use operands with types dtype('<M8[ns]') and dtype('float64')

Matplotlib version

  • Operating system: Windows 10 (15063.540)
  • Matplotlib (retrieved from pip) version: 2.1.0
  • Matplotlib backend (print(matplotlib.get_backend())): TkAgg
  • Python version: 3.6.2
  • Other libraries: numpy 1.13.3, pandas 0.21.0, pandas-datareader=0.5.0
@tacaswell tacaswell added this to the v2.2 milestone Oct 29, 2017
@tacaswell
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Something is not going correct with the unit handling (which in what converts from datetime objcets / np.datetime values -> floats that we can plot). It looks like only one or neither of the values an being converted here as we attempt to center the bars.

@QuLogic
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QuLogic commented Oct 29, 2017

Same problem as #9610 perhaps?

@dstansby
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Yep, I'd guess it is the same root issue as #9610

@timhoffm
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Works here on 2.2.2. Probably fixed by #9779.

Please reopen if there are still issues.

@QuLogic QuLogic modified the milestones: needs sorting, v2.2.0 Mar 21, 2018
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@tacaswell @QuLogic @timhoffm @dstansby @JohnsonY1995