1"""
2===============================
3Legend using pre-defined labels
4===============================
5
6Defining legend labels with plots.
7"""
8
9
10import numpy as np
11import matplotlib.pyplot as plt
12
13# Make some fake data.
14a = b = np.arange(0, 3, .02)
15c = np.exp(a)
16d = c[::-1]
17
18# Create plots with pre-defined labels.
19fig, ax = plt.subplots()
20ax.plot(a, c, 'k--', label='Model length')
21ax.plot(a, d, 'k:', label='Data length')
22ax.plot(a, c + d, 'k', label='Total message length')
23
24legend = ax.legend(loc='upper center', shadow=True, fontsize='x-large')
25
26# Put a nicer background color on the legend.
27legend.get_frame().set_facecolor('#00FFCC')
28
29plt.show()
30