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September 2012

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Matplotlib-animation problem
by William R. Wing (Bill Wing) Sept. 5, 2012

Sept. 5, 2012

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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