How to add a title to a Matplotlib legend?

In Matplotlib, you can add a title to a legend using the set_title method of the Legend object. Here's how you can add a title to a legend:

Example:

import matplotlib.pyplot as plt
import numpy as np

# Generate some sample data
x = np.linspace(0, 10, 100)
y1 = np.sin(x)
y2 = np.cos(x)

# Plot the data
plt.plot(x, y1, label="sin(x)")
plt.plot(x, y2, label="cos(x)")

# Add legend with title
legend = plt.legend(loc="upper right")
legend.set_title("Functions")

plt.show()

In the above code:

1. We plot two functions: sin(x) and cos(x).
2. We then call plt.legend() to create the legend and specify its location with the loc argument.
3. We use the set_title method of the Legend object to set the title of the legend.

The resulting plot will display a legend with the title "Functions" and two legend entries corresponding to the two plotted functions.

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