I suspect the problem is that matplotlib needs constant-length arrays to plot two on the same plot. For each 'tick' of the animate function it will need to know what value to write for that instant.

Advanced Matplotlib Concepts In this section we cover some more advanced topics which you won't usually use as often.

Figure Object Now that we've seen the basics, let's break it all down with a more formal introduction of Matplotlib's Object Oriented API. This means we will instantiate figure objects and then call ...

Unlike plots and subplots, which are prepared in advance to create an outline for a story, plot filaments emerge creatively and organically from the story as the manuscript progresses.

Users can just sketch out a basic outline or character biography, but Subplot lends itself to going more in-depth with characters and plot points.