This post explains the complex-step derivative approximation - a formidable-sounding but simple and elegant numerical method to compute the first derivative of a function using complex arithmetic.
...This post is the second in a series on how to use the matplotlib.animation module to create animated plots. The examples here use this module to create animations of 2D random walks.
This is the first part of a series on how to use the matplotlib.animation module to create animated plots. The examples here show how to visualize traveling waves and the phenomenon of superposition.