matplotlib-users Mailing List for matplotlib

Hi.
I'm using windows 7, with python(x,y) 2.7.5.0 installed. I then installed
matplotlib 1.3.1 and imagemagick.
Something goes wrong when try to save animation as a gif file.
I used a base_animation.py within ipython notebook as followed:
code:
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import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
# First set up the figure, the axis, and the plot element we want to animate
fig = plt.figure()
ax = fig.add_subplot(111, xlim=(0, 2), ylim=(-2, 2))
line, = ax.plot([], [], lw=2)
# initialization function: plot the background of each frame
def init():
 line.set_data([], [])
 return line,
# animation function. This is called sequentially
def animate(i):
 x = np.linspace(0, 2, 1000)
 y = np.sin(2 * np.pi * (x - 0.01 * i))
 line.set_data(x, y)
 return line,
# call the animator. blit=True means only re-draw the parts that have
changed.
anim = animation.FuncAnimation(fig, animate, init_func=init,
 frames=100, interval=20, blit=True)
# this is how you save your animation to file:
#anim.save('animation.gif', writer='imagemagick_file', fps=30)
anim.save('animation.gif', writer='imagemagick', fps=30)
plt.show()
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And I got an error message like this:
---------------------------------------------------------------------------RuntimeError
 Traceback (most recent call
last)<ipython-input-2-7b2f7b9edcb4> in <module>() 26 # this is how
you save your animation to file: 27 #anim.save('animation.gif',
writer='imagemagick_file', fps=30)---> 28 anim.save('animation.gif',
writer='imagemagick', fps=30) 29 30 plt.show()
D:\Python27\lib\site-packages\matplotlib\animation.pyc in save(self,
filename, writer, fps, dpi, codec, bitrate, extra_args, metadata,
extra_anim, savefig_kwargs) 716 #TODO: Need to
see if turning off blit is really necessary 717
anim._draw_next_frame(d, blit=False)--> 718
writer.grab_frame(**savefig_kwargs) 719 720 # Reconnect
signal for first draw if necessary
D:\Python27\lib\site-packages\matplotlib\animation.pyc in
grab_frame(self, **savefig_kwargs) 202 # frame format
and dpi. 203 self.fig.savefig(self._frame_sink(),
format=self.frame_format,--> 204
dpi=self.dpi, **savefig_kwargs) 205 except RuntimeError:
206 out, err = self._proc.communicate()
D:\Python27\lib\site-packages\matplotlib\figure.pyc in savefig(self,
*args, **kwargs) 1419 self.set_frameon(frameon) 1420
-> 1421 self.canvas.print_figure(*args, **kwargs) 1422
1423 if frameon:
D:\Python27\lib\site-packages\matplotlib\backend_bases.pyc in
print_figure(self, filename, dpi, facecolor, edgecolor, orientation,
format, **kwargs) 2218 orientation=orientation,
2219 bbox_inches_restore=_bbox_inches_restore,-> 2220
 **kwargs) 2221 finally: 2222 if
bbox_inches and restore_bbox:
D:\Python27\lib\site-packages\matplotlib\backends\backend_agg.pyc in
print_raw(self, filename_or_obj, *args, **kwargs) 495
close = False 496 try:--> 497
renderer._renderer.write_rgba(filename_or_obj) 498 finally:
 499 if close:
RuntimeError: Error writing to file
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Can anybody help?
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WANG Aiyong