Re: [Matplotlib-users] Couldn't save animation as gif

[Aiyong W. <gep...@gm...>]

Today I setuped a ubuntu virtual machine, installed matplotlib 1.3.1
(builded and installed from source), installed ImageMagick via 'apt-get',
and tried again that sample.
It worked.

So Does the imagemagick writer not work on Windows, or am I missing
something in my Win7 ?

Can anybody help ?
Thank you.


2013/10/13 Aiyong WANG <gep...@gm...>

> 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:
>
> -------------------------------------------------------------------------------------
> 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()
>
> ----------------------------------------------------------------------------------
>
>
>
> 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
>
> --
>
> Can anybody help?
> ------------------------------------------------------------------
> WANG Aiyong
>



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WANG Aiyong