Improperly spaced time axis #6437
Description
I've put a short reproducible example in this gist: https://gist.github.com/jbwhit/467e154cef029f8098d560924f14612c
The problem can be seen in this screenshot
Notice how, for example, November is wider than December (so it isn't merely the number of days in each month). My conda installed setup's details:
Software Version
Python 2.7.11 64bit [GCC 4.2.1 (Apple Inc. build 5577)]
IPython 4.2.0
OS Darwin 14.5.0 x86_64 i386 64bit
numpy 1.11.0
matplotlib 1.5.1
pandas 0.17.1
Mon May 16 20:54:59 2016 PDT
The code in the gist is as follows:
%matplotlib inline
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd
ids = [1,2,3,4]
dates = pd.date_range('20150704', '20160331')
vals = np.random.randn(len(ids)*len(dates))
allids = np.array([np.repeat(i, len(dates)) for i in ids]).ravel()
alldates = np.tile(dates, len(ids))
df = (pd.DataFrame(np.vstack((allids, vals)).T, index=alldates)
.reset_index().rename(columns={'index':'datetime',0:'unique_id',1:'height'}))
time_group = '1w'
threshold = 0.50
fig, axes = plt.subplots(nrows=4, ncols=1, figsize=(12, 16), sharex=True)
for (i, temp), ax in zip(df.groupby('unique_id'), axes.ravel()):
(temp.set_index('datetime').height
.groupby(pd.TimeGrouper(time_group))
.mean()
.plot(ax=ax))