How can I draw horizontal lines in Matplotlib plots?

Plotting Horizontal Lines in Matplotlib

When working with plots, adding horizontal lines can enhance visualizations and highlight specific values. In this regard, Matplotlib's powerful features provide a convenient way to incorporate horizontal lines into your plots.

Adding Horizontal Lines Using axhline()

The axhline() function is designed specifically for plotting horizontal lines. It takes two primary arguments:

• y: The y-coordinate of the line.
• color (optional): The color of the line.
• linestyle (optional): The style of the line, such as solid, dashed, or dotted.

Example:

To demonstrate the use of axhline(), let's plot a horizontal line at y = 0.5.

import matplotlib.pyplot as plt

plt.axhline(y=0.5, color='r', linestyle='-')
plt.show()

In this code:

• plt.axhline(y=0.5) creates a horizontal line at y = 0.5.
• color='r' sets the line color to red.
• linestyle='-' indicates a solid line.

When you run the code, you'll see a plot with a horizontal red line at y = 0.5.

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