Re: [Pythonmac-SIG] Matplotlib-animation problem

[Thomas Robitaille]

It's a known problem with the MacOS X backend:

http://matplotlib.1069221.n5.nabble.com/Animation-example-error-on-Mac-after-installation-td26960.html

Try changing backend - for example, add

import matplotlib
matplotlib.use('TkAgg')

just *before*

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

This works for me.

Cheers,
Tom

On 4 September 2012 20:19, William R. Wing (Bill Wing)  wrote:
> I'm running Mac OS-X 10.8.1, with python 2.7.3, numpy 1.8.0, matplotlib 1.2,
> and wxPython 2.9.3.1 (although wx isn't involved here, at least I don't
> think so).  I'm running on a dual-quad processor Xeon Mac Pro.
>
> I decided to learn something about animated matplotlib graphics, so started
> to look at the examples in
> http://matplotlib.sourceforge.net/examples/animation/...
>
> I consistently run into a problem, illustrated below.  Starting from the
> animate_decay.py code, copied and pasted into an editor as here:
>
> #!/usr/bin/env python
> """
>  http://matplotlib.sourceforge.net/examples/animation/animate_decay.html
> """
>
> import numpy as np
> import matplotlib.pyplot as plt
> import matplotlib.animation as animation
>
> def data_gen():
>  t = data_gen.t
>  cnt = 0
>  while cnt < 1000:
>  cnt+=1
>  t += 0.05
>  yield t, np.sin(2*np.pi*t) * np.exp(-t/10.)
> data_gen.t = 0
>
> fig = plt.figure()
> ax = fig.add_subplot(111)
> line, = ax.plot([], [], lw=2)
> ax.set_ylim(-1.1, 1.1)
> ax.set_xlim(0, 5)
> ax.grid()
> xdata, ydata = [], []
> def run(data):
>  # update the data
>  t,y = data
>  xdata.append(t)
>  ydata.append(y)
>  xmin, xmax = ax.get_xlim()
>
>  if t >= xmax:
>  ax.set_xlim(xmin, 2*xmax)
>  ax.figure.canvas.draw()
>  line.set_data(xdata, ydata)
>
>  return line,
>
> ani = animation.FuncAnimation(fig, run, data_gen, blit=True, interval=10,
>  repeat=False)
> plt.show()
>
>
> If I attempt to run this script (or any of several others), I get:
>
> StraylightPro:Matplotlib_stuff wrw$ ./animate_decay.py
> Traceback (most recent call last):
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/backend_bases.py",
> line 1117, in _on_timer
>  ret = func(*args, **kwargs)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 763, in _step
>  still_going = Animation._step(self, *args)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 625, in _step
>  self._draw_next_frame(framedata, self._blit)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 645, in _draw_next_frame
>  self._post_draw(framedata, blit)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 668, in _post_draw
>  self._blit_draw(self._drawn_artists, self._blit_cache)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 682, in _blit_draw
>  bg_cache[a.axes] = a.figure.canvas.copy_from_bbox(a.axes.bbox)
> AttributeError: 'FigureCanvasMac' object has no attribute 'copy_from_bbox'
> Traceback (most recent call last):
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/backend_bases.py",
> line 1117, in _on_timer
>  ret = func(*args, **kwargs)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 763, in _step
>  still_going = Animation._step(self, *args)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 625, in _step
>  self._draw_next_frame(framedata, self._blit)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 643, in _draw_next_frame
>  self._pre_draw(framedata, blit)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 656, in _pre_draw
>  self._blit_clear(self._drawn_artists, self._blit_cache)
> File
> "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
> line 696, in _blit_clear
>  a.figure.canvas.restore_region(bg_cache[a])
> AttributeError: 'FigureCanvasMac' object has no attribute 'restore_region'
>
>
> …and the 'restore-region' error sequence then repeats endlessly.
>
> I'm hoping this is all caused by my not quite having the right library
> installed someplace along the line.  If anyone could point it out, I'd sure
> appreciate it.
>
> Thanks,
> Bill
>
> ___
> Pythonmac-SIG maillist  -  Pythonmac-SIG@python.org
> http://mail.python.org/mailman/listinfo/pythonmac-sig
> unsubscribe: http://mail.python.org/mailman/options/Pythonmac-SIG
>

Re: [Pythonmac-SIG] Matplotlib-animation problem

[Ned Deily]

In article <67de0fd9-ad6f-4470-aea2-7fef70dc6...@mac.com>,
 "William R. Wing (Bill Wing)"  wrote:
> I'm running Mac OS-X 10.8.1, with python 2.7.3, numpy 1.8.0, matplotlib 1.2, 
> and wxPython 2.9.3.1 (although wx isn't involved here, at least I don't think 
> so).  I'm running on a dual-quad processor Xeon Mac Pro.
> 
> I decided to learn something about animated matplotlib graphics, so started 
> to look at the examples in 
> http://matplotlib.sourceforge.net/examples/animation/...
> 
> I consistently run into a problem, illustrated below.  Starting from the 
> animate_decay.py code, copied and pasted into an editor as here:
[...]> 
> ...and the 'restore-region' error sequence then repeats endlessly.
> 
> I'm hoping this is all caused by my not quite having the right library 
> installed someplace along the line.  If anyone could point it out, I'd sure 
> appreciate it.

I have no experience with matplotlib other than having played with a few 
of the examples.  I have the current versions from MacPorts installed 
(1.1.1 with MacPorts numpy 1.6.2 and MacPorts python 2.7.3, no wxPython, 
all on 10.8.1) and, FWIW, I see the same behavior running your example 
as you report.

-- 
 Ned Deily,
 n...@acm.org

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[Pythonmac-SIG] Matplotlib-animation problem

[William R. Wing (Bill Wing)]

I'm running Mac OS-X 10.8.1, with python 2.7.3, numpy 1.8.0, matplotlib 1.2, 
and wxPython 2.9.3.1 (although wx isn't involved here, at least I don't think 
so).  I'm running on a dual-quad processor Xeon Mac Pro.

I decided to learn something about animated matplotlib graphics, so started to 
look at the examples in http://matplotlib.sourceforge.net/examples/animation/...

I consistently run into a problem, illustrated below.  Starting from the 
animate_decay.py code, copied and pasted into an editor as here:

#!/usr/bin/env python
"""
 http://matplotlib.sourceforge.net/examples/animation/animate_decay.html
"""

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

def data_gen():
 t = data_gen.t
 cnt = 0
 while cnt < 1000:
 cnt+=1
 t += 0.05
 yield t, np.sin(2*np.pi*t) * np.exp(-t/10.)
data_gen.t = 0

fig = plt.figure()
ax = fig.add_subplot(111)
line, = ax.plot([], [], lw=2)
ax.set_ylim(-1.1, 1.1)
ax.set_xlim(0, 5)
ax.grid()
xdata, ydata = [], []
def run(data):
 # update the data
 t,y = data
 xdata.append(t)
 ydata.append(y)
 xmin, xmax = ax.get_xlim()

 if t >= xmax:
 ax.set_xlim(xmin, 2*xmax)
 ax.figure.canvas.draw()
 line.set_data(xdata, ydata)

 return line,

ani = animation.FuncAnimation(fig, run, data_gen, blit=True, interval=10,
 repeat=False)
plt.show()


If I attempt to run this script (or any of several others), I get:

StraylightPro:Matplotlib_stuff wrw$ ./animate_decay.py
Traceback (most recent call last):
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/backend_bases.py",
 line 1117, in _on_timer
 ret = func(*args, **kwargs)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 763, in _step
 still_going = Animation._step(self, *args)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 625, in _step
 self._draw_next_frame(framedata, self._blit)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 645, in _draw_next_frame
 self._post_draw(framedata, blit)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 668, in _post_draw
 self._blit_draw(self._drawn_artists, self._blit_cache)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 682, in _blit_draw
 bg_cache[a.axes] = a.figure.canvas.copy_from_bbox(a.axes.bbox)
AttributeError: 'FigureCanvasMac' object has no attribute 'copy_from_bbox'
Traceback (most recent call last):
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/backend_bases.py",
 line 1117, in _on_timer
 ret = func(*args, **kwargs)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 763, in _step
 still_going = Animation._step(self, *args)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 625, in _step
 self._draw_next_frame(framedata, self._blit)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 643, in _draw_next_frame
 self._pre_draw(framedata, blit)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 656, in _pre_draw
 self._blit_clear(self._drawn_artists, self._blit_cache)
File 
"/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/animation.py",
 line 696, in _blit_clear
 a.figure.canvas.restore_region(bg_cache[a])
AttributeError: 'FigureCanvasMac' object has no attribute 'restore_region'


…and the 'restore-region' error sequence then repeats endlessly.

I'm hoping this is all caused by my not quite having the right library 
installed someplace along the line.  If anyone could point it out, I'd sure 
appreciate it.

Thanks,
Bill
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