matplotlib Plotting Cookbook

Plotting stacked bar charts

Stacked bar charts are of course possible by using a special parameter from the pyplot.bar() function.

How to do it...

The following script stacks two bar charts on each other:

import matplotlib.pyplot as plt

A = [5., 30., 45., 22.]
B = [5., 25., 50., 20.]

X = range(4)

plt.bar(X, A, color = 'b')
plt.bar(X, B, color = 'r', bottom = A)
plt.show()

The preceding script will produce the following graph:

How it works...

The optional bottom parameter of the pyplot.bar() function allows you to specify a starting value for a bar. Instead of running from zero to a value, it will go from the bottom to value. The first call to pyplot.bar() ...