Matplotlib: Draw Vertical Lines on Plot Using ax.vlines()

In this tutorial, we will use an example to show you how to draw vertical lines on a plot using ax.vlines() in matplotlib.

1.Import library

import matplotlib.pyplot as plt
import numpy as np

2.Create a plot

fig, ax = plt.subplots(figsize=(12, 6))

3.Prepare data

np.random.seed(42)
x = np.random.rand(150)

4.Draw vertical lines using ax.vlines()

ax.plot(x)

ax.vlines([20, 100], 0, 1, linestyles='dashed', colors='red')

plt.show()

Run this code, you will see:

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