On 12/18/2011 01:13 PM, Wes McKinney wrote:
> This is a new one on me and extremely distressing:
>
> If I plot 139 dates versus 139 values, everything is OK
>
> In [40]: stamp = datetime.today()
>
> In [44]: from datetime import timedelta
>
> In [45]: inc = timedelta(1)
>
> In [46]: stamps = [stamp + inc * i for i in xrange(139)]
>
> In [47]: values = np.random.randn(139)
>
> In [48]: plt.plot(stamps, values)
> Out[48]: [<matplotlib.lines.Line2D at 0x6ed0e50>]
>
> See plot 1 attached
>
> However, if I increase it to 140 (!), all hell breaks loose:
>
> In [49]: stamps = [stamp + inc * i for i in xrange(140)]
>
> In [50]: values = np.random.randn(140)
>
> In [51]: plt.plot(stamps, values)
> Out[51]: [<matplotlib.lines.Line2D at 0x73a21d0>]
>
> see plot 2
>
> It seems to get ahold of itself at 153 dates (but not 152!). I tested
> this both with git master and v1.1.0. I don't even know what to say.

Confirmed. The AutoDateLocator is using an RRuleLocator which is 
cranking out a tick for every day.  I suspect the problem is in 
AutoDateLocator.get_locator(); it is not finding what it is looking for, 
so it is falling back on a default.  I can't look into it any time soon, 
so I hope someone else can; I'm not familiar with this code.

Eric

>
> thanks,
> Wes

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