15 Feb Add a Matplotlib Legend in a Graph
A legend in a graph is a box on the left and right displaying the data from the columns. Legend generally helps the readers in understanding the graph.
Here is what a legend looks like in a graph:
The legend() function is used to create a legend in Matplotlib.
Let us now see a complete example of legends in a graph in Matplotlib. We have plotted the frequencies of a signal in this example:
import numpy as np
import matplotlib.pyplot as plt
a = np.arange(5)
b = [2,4,6,8,10]
c = [5, 6, 7, 8, 9]
# Create plots
fig = plt.figure()
ax = plt.subplot()
ax.plot(a, b, 'k--', label='Frequency')
ax.plot(a, c, 'k:', label='Periods')
# Create a legend using the Matplotlib Axes.legend() method in Python
# Plot Title
plt.title("Frequency of a Signal")
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