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Blitting not working for the osx backend is a long standing issue due to
differences between what is allowed in the different gui frame works.
You have to change the backend via `use` before you import pyplot. If you
are still getting the error it is likely you tried to change the backend
_after_ pyplot was imported, in which case the `use` command does nothing.
Tom
On Sat, May 30, 2015 at 11:03 PM Peter Rowat <pe...@pe...> wrote:
> I’m on OS X, trying to write a multi-slider-controlled animation. If I
> have blit=True in the call to matplotlib.animation,
> I get this message
>
> matplotlib.animation.BackendError: The current backend is 'MacOSX'
> and may go into an infinite loop with blit turned on. Either
> turn off blit or use an alternate backend, for example, like
> 'TKAgg', using the following prepended to your source code:
>
> import matplotlib
> matplotlib.use('TKAgg’)
> =====
>
> When I make this change I still get the same error message, whether blit
> is set True or False.
> At least when blit=False the animation runs, which I can live with for the
> moment.
>
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I’m on OS X, trying to write a multi-slider-controlled animation. If I have blit=True in the call to matplotlib.animation,
I get this message
matplotlib.animation.BackendError: The current backend is 'MacOSX'
and may go into an infinite loop with blit turned on. Either
turn off blit or use an alternate backend, for example, like
'TKAgg', using the following prepended to your source code:
import matplotlib
matplotlib.use('TKAgg’)
=====
When I make this change I still get the same error message, whether blit is set True or False. 
At least when blit=False the animation runs, which I can live with for the moment. 

Hello,
My latest fractal music video, made with
MatPlotLib.
Enjoy!
--Prahas
https://www.youtube.com/watch?v=kh6ZLvpWr5k&feature=youtu.be

You could define the overlay data for the whole length and mask out the
irrelevant part using numpy.ma.
You could also just plot the two parts separately using the appropriate
length of the x coordinate.
Xa = range (1,10)
Xb = range (100, 110)
plot (Xa, data1)
plot (Xb, data2)
On 31 May 2015 00:42, "peter" <com...@ya...> wrote:
> hi,
>
>
> ive got a graph which should be overlayed with something, but the
> overlay graph isnt defined for all x
> values.
>
> for example, overlay goes from x=1 to 1=10, then pauses for 100 and then
> continues with 10 values.
> how do you do that?
>
>
> greetings
>
>
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