I'm graphing data from a web service, and seem to have stumbled upon a
bug when dates are graphed without any values.
Here's a minimum repro:
import datetime
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(111)
x = []
st = datetime.datetime(2012,11,21)
while st < datetime.datetime(2012,11,21, 16, 00):
x.append(st)
st = st + datetime.timedelta(minutes=30)
y = [None] * len(x)
ax.plot(x,y)
fig.autofmt_xdate()
plt.show()
The stack trace I get:
Traceback (most recent call last):
File "min_mpl.py", line 15, in <module>
fig.autofmt_xdate()
File "c:\python26\lib\site-packages\matplotlib\figure.py", line 318,
in autofmt_xdate
for label in ax.get_xticklabels():
File "c:\python26\lib\site-packages\matplotlib\axes.py", line 2507,
in get_xticklabels
self.xaxis.get_ticklabels(minor=minor))
File "c:\python26\lib\site-packages\matplotlib\axis.py", line 1104,
in get_ticklabels
return self.get_majorticklabels()
File "c:\python26\lib\site-packages\matplotlib\axis.py", line 1088,
in get_majorticklabels
ticks = self.get_major_ticks()
File "c:\python26\lib\site-packages\matplotlib\axis.py", line 1186,
in get_major_ticks
numticks = len(self.get_major_locator()())
File "c:\python26\lib\site-packages\matplotlib\dates.py", line 749,
in __call__
self.refresh()
File "c:\python26\lib\site-packages\matplotlib\dates.py", line 758, in refresh
dmin, dmax = self.viewlim_to_dt()
File "c:\python26\lib\site-packages\matplotlib\dates.py", line 530,
in viewlim_to_dt
return num2date(vmin, self.tz), num2date(vmax, self.tz)
File "c:\python26\lib\site-packages\matplotlib\dates.py", line 289,
in num2date
if not cbook.iterable(x): return _from_ordinalf(x, tz)
File "c:\python26\lib\site-packages\matplotlib\dates.py", line 203,
in _from_ordinalf
dt = datetime.datetime.fromordinal(ix)
ValueError: ordinal must be >= 1
Adding a 0 & the current date stops getting the exception, but the
range seems wildly messed up. (2011 - 2014).
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