On Wed, Jul 14, 2010 at 4:54 AM, Robert Hancock <r...@agelada.co.uk> wrote:
> Hi
>
> I am trying to use autofmt_xdate() on graphs with more than 1 y-axis. But
> it
> seems that even calling twinx() causes errors. On python 2.5 matplotlib
> 0.98
> a call to twinx() seems to switch off the functioning of autofmt_xdate()
> (and the labels are horizontal and mashed up). On python 2.6 and matplotlib
> 1.0.0 it causes a ValueError.
>
> The following script illustrates the issue (in real life I obviously want
> to
> do things with ax2, but it seems that even creating it causes problems). Is
> there a simple working example of rotated data formats and twinx()?
>
> robert
>
> import datetime
> import matplotlib
> matplotlib.use('Agg')
> import matplotlib.pyplot as plt
>
> date=[datetime.datetime(2010,1,1), datetime.datetime(2010,12,1)]
> data=[1,2]
>
> fig = plt.figure()
> ax = fig.add_subplot(111)
> # uncommenting the following line will lead to the problems
> # ax2=ax.twinx()
> ax.plot(date, data)
>
> fig.autofmt_xdate(rotation=90)
>
> fig.savefig("test3.png", dpi=400)
>
>
>
For further information, here is the Value Error on matplotlib 1.0
(replacing the savefig with a show):
Traceback (most recent call last):
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_gtk.py",
line 389, in expose_event
self._render_figure(self._pixmap, w, h)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_gtkagg.py",
line 75, in _render_figure
FigureCanvasAgg.draw(self)
File
"/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/backends/backend_agg.py",
line 394, in draw
self.figure.draw(self.renderer)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/figure.py",
line 798, in draw
func(*args)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/axes.py",
line 1934, in draw
a.draw(renderer)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/artist.py",
line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/axis.py",
line 971, in draw
tick_tups = [ t for t in self.iter_ticks()]
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/axis.py",
line 904, in iter_ticks
majorLocs = self.major.locator()
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/dates.py",
line 743, in __call__
self.refresh()
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/dates.py",
line 752, in refresh
dmin, dmax = self.viewlim_to_dt()
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/dates.py",
line 524, in viewlim_to_dt
return num2date(vmin, self.tz), num2date(vmax, self.tz)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/dates.py",
line 289, in num2date
if not cbook.iterable(x): return _from_ordinalf(x, tz)
File "/home/bvr/Programs/matplotlib/matplotlib/lib/matplotlib/dates.py",
line 203, in _from_ordinalf
dt = datetime.datetime.fromordinal(ix)
ValueError: ordinal must be >= 1
Ben Root
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