How can I add a horizontal line to an existing plot in Matplotlib?

Adding Horizontal Lines to Existing Plots

To include a horizontal line on a previously generated plot, the axhline function can be utilized, specifically designed to create horizontal axis lines.

Example Usage:

To illustrate its functionality, consider plotting a horizontal line at y = 0.5:

import matplotlib.pyplot as plt

# Create plot
# ...

# Add horizontal line
plt.axhline(y=0.5, color='r', linestyle='-')

# Display plot
plt.show()

Output:

The resulting plot will include a horizontal red line located at y = 0.5.

Additional Notes:

• The y parameter represents the y-coordinate of the line.
• The color parameter specifies the line color, and linestyle defines the line style (e.g., dashed, solid).

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