Hello,
I am having trouble setting the formatting for date objects that are
displayed on the tick marks of one graph that I am making. The following
example code reproduces the problem for me:
from datetime import date
import matplotlib.dates as mdate
import matplotlib.pyplot as plt
p1 = plt.subplot(211)
p1.yaxis.set_major_formatter(mdate.DateFormatter('%b %d', None))
plt.plot([date(2002, 3, 10)], [1])
The traceback that I am getting is as follows:
Traceback (most recent call last):
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/figure.py",
line 798, in draw
func(*args)
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/axes.py",
line 1934, in draw
a.draw(renderer)
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/axis.py",
line 971, in draw
tick_tups = [ t for t in self.iter_ticks()]
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/axis.py",
line 907, in iter_ticks
majorLabels = [self.major.formatter(val, i) for i, val in
enumerate(majorLocs)]
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/dates.py",
line 335, in __call__
dt = num2date(x, self.tz)
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/dates.py",
line 289, in num2date
if not cbook.iterable(x): return _from_ordinalf(x, tz)
File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/dates.py",
line 203, in _from_ordinalf
dt = datetime.datetime.fromordinal(ix)
ValueError: ordinal must be >= 1
Any idea what I could be doing wrong with my formatting here? I am using
Matplotlib version 1.0.0. Thanks very much,
Adrian
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