On Wed, Jul 29, 2009 at 1:01 AM, Art<grenan...@gmail.com> wrote:
> I have a scatter plot that requires some time to render. The horizontal axis
> is time. Currently, I generate the full scatter plot each time and draw a
> axvline to indicate the progress of time, save the file as a png for each
> time, and generate a movie for all time frames. The scatter plot portion
> doesn't change, just the vertical line.
>
> I was wondering if there was a way to speed this up, to generate the scatter
> plot once and then overlay it with a moving axvline. I would still have to
> save the png frame by frame, but the most expensive step by far is
> replotting the scatter plot over and over.

This is what the animation/blit api is designed to do:

http://www.scipy.org/Cookbook/Matplotlib/Animations

scipy.org appears down right now, so you may need to try again later.
See also these mpl examples:

http://matplotlib.sourceforge.net/search.html?q=codex+blit

JDH

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