On 08/27/2010 05:17 PM, Chiara Caronna wrote:
> Ok, it is a backend issue:
> I checked and I was using Qt4Agg
> as soon as I changed to TkAgg the script worked fine...
> still is this normal or is it a bug?
> thanks for your suggestion and help!

Chiara,

As a workaround for Qt4Agg, you can follow p.draw() with 
fig.canvas.flush_events().

I think this is a bug that will be fixed easily by incorporating the 
flush functionality in the draw method, but I'm not ready to commit to 
it yet.

I wonder whether you were using a different backend when you were using 
0.99.1.1?  Or a different version of PyQt4?

Eric

> Chiara
>
> ------------------------------------------------------------------------
> From: chiaracaro...@hotmail.com
> To: ben.r...@ou.edu
> Date: Sat, 28 Aug 2010 03:01:54 +0000
> CC: matplotlib-users@lists.sourceforge.net
> Subject: Re: [Matplotlib-users] realtime plotting was working with
> matplotlib 0.99.1.1 and it doesn't with matplotlib 1.0.0
>
> I think I am using TkAgg but I am not sure, how can I check it?
>
> ------------------------------------------------------------------------
> From: ben.r...@ou.edu
> Date: Fri, 27 Aug 2010 21:50:19 -0500
> Subject: Re: [Matplotlib-users] realtime plotting was working with
> matplotlib 0.99.1.1 and it doesn't with matplotlib 1.0.0
> To: chiaracaro...@hotmail.com
> CC: matplotlib-users@lists.sourceforge.net
>
> On Fri, Aug 27, 2010 at 9:26 PM, Chiara Caronna
> <chiaracaro...@hotmail.com <mailto:chiaracaro...@hotmail.com>> wrote:
>
>     Hi all,
>     I have a script to update a plot in real time. It was working fine
>     with matplotlib 0.99.1.1 but it doesn't work anymore with the new
>     version.
>
>     Here is the script:
>
>     import numpy as n
>     import pylab as p
>
>     x=n.arange(10)
>     y=n.random.randn(10)
>     p.ion()
>     fig=p.figure(1)
>     ax=fig.add_subplot(111)
>     line,=ax.plot(x,y,'ko-')
>     for i in range(10):
>     y=n.random.randn(10)
>     line.set_data(x,y)
>     p.draw()
>
>
>     it is updating the plot correctly with matplotlib 0.99.1.1
>     when I run it with matplotlib 1.0.0
>     it doesn't show any picture at all
>
>     Interestingly, if I add a line raw_input('ok') then it shows the
>     plot and it updates it inside the loop....
>
>
>     x=n.arange(10)
>     y=n.random.randn(10)
>     p.ion()
>     fig=p.figure(1)
>     ax=fig.add_subplot(111)
>     line,=ax.plot(x,y,'ko-')
>     raw_input('ok?')
>     for i in range(10):
>     y=n.random.randn(10)
>     line.set_data(x,y)
>     p.draw()
>     raw_input('ok?')
>
>     Any idea why it is doing this? Is it a bug or am I missing something?
>
>     Thanks for your help,
>     Chiara
>
>
> It seems to work fine for me using the GTKAgg backend. Which backend are
> you using? Also, admittedly, this is the trunk build, so it might have
> some fixes that weren't in the release.
>
> Ben Root
>
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