Solved my own bone-headded problem. I should have been using "p1.xaxis"
instead of "p1.yaxis". Sorry for the pointless post.
Adrian
2010/12/4 Adrian <adrian.d...@duke.edu>
> 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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