Re: [Matplotlib-users] plot range affected by axvspan() call

On 05/17/2011 01:53 AM, Joachim Saul wrote:
> All,
>
> I have stumbled upon a (for me) unexpected behaviour of axvspan().
>
>
> import matplotlib.pylab as plt
> from numpy import *
>
> x = arange(1000)
> y = 0.2*sin(0.02*x)
>
> ax = plt.axes()
> plt.axvspan(250, 400, facecolor='g', alpha=0.2)
> plt.plot(x,y)
> plt.show()
>
>
> The displayed y range is -0.2 to 1, while from the sine amplitude I
> would have expected -0.2 to 0.2. The expected y range can be obtained by
> omitting the axvspan() call and also if it is called *after* plot().
>
> Is this the desired behaviour, especially in view of the dependence on
> the call order?

No, it is a bug.

Eric

>
> __version__ is 1.1.0
>
> Cheers,
> Joachim
>
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