I have two animations, I created using the animate command, which I want to save in the same avi or gif file one below another. Is there a way to do it. I tried (a+b).savefig(), but it saves the two animations on top of one another. I want something like the graphics_array but for animations.
Thanks in advance.
If you wanted to install the newest version of matplotlib (which is what Sage uses to draw 2d graphics), you could use the new matplotlib animation framework. Here's an example like what you are asking about: http://matplotlib.sourceforge.net/exa...
Just realised that the latest sage version (4.7.2) has matplotlib 1.0.1. I don't know how to upgrade it. So I just upgraded just install the latest matplotlib using easy_install and copied the matplotlib directory to $(sage)/local/lib/python2.6/site-packages. Now when I try to save the plots as a mp4 movie I just get a bunch of images and an error "Traceback (most recent call last): cnt = 0 File "", line 1, in <module> File "/private/var/folders/p8/p8t8MhXCF0uDsptKlAw5Yk+++TI/-Tmp-/tmpxz1OZL/___code___.py", line 39, in <module> exec compile(u"ani.save('test.mp4')" + '\n', '', 'single') File "", line 1, in <module> File "/Applications/sage/local/lib/python2.6/site-packages/matplotlib/animation.py", line 127, in save self._make_movie(filename, fps, codec, fr"
I manages to install matplotlib 1.1 on my system python, and make it spit out a bunch of png files. I then used mencoder to convert it to a avi. So my problem is solved for now, though it is not as smooth as I would have wanted it to be. It would be great if the matplotlib in sage could be upgraded to 1.1 soon.
I tried it. Does not work. It works for plots not for animations. If I animate graphics array, I get animations on top of each other. I don't want that. I am trying to do a presentation where I have a plot changing as a function of time. And I have two such plots for different inputs. I want to show them side by side for comparison, but they should be synced. I have two animations in two gif files. But when I open them in my presentation they are not synced.
This is based on http://www.imagemagick.org/Usage/anim... . Naturally, you need imagemagick installed.
Say you created pic1.gif and pic2.gif, with the same number of frames:
sage: animate([sin(x + float(k)) for k in srange(0,2*pi,0.3)],xmin=0, xmax=2*pi, figsize=[2,1]).save('pic1.gif')
sage: animate([cos(x + float(k)) for k in srange(0,2*pi,0.3)],xmin=0, xmax=2*pi, figsize=[2,1]).save('pic2.gif')
Download and make executable the scripts here and here.
Execute the following, changing NUM_FRAMES to the number of frames (21 here, look at the files generated by gif2anim if you are not sure):
gif2anim -c pic1.gif
gif2anim -c pic2.gif
for i in `seq -f '%03g' 1 NUM_FRAMES`; do convert pic1_$i.gif pic2_$i.gif -append pic3_$i.gif; done
anim2gif -c -g -b pic3 pic1.anim
You should have pic3.gif with the two animation vertically stacked. If you change -append to +append you get them side by side.
Asked: 2011-12-08 13:17:02 +0100
Seen: 1,848 times
Last updated: Dec 10 '11
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