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Plotting two lines with different y axis in Matplotlib

Programming
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Python
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Matplotlib
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Axes Cookbook
schedule Jul 1, 2022
Last updated
local_offer PythonMatplotlib
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We can plot two lines with different y axis in Matplotlib using the twinx() method.

Example

To plot two sets of y values y1 and y2 on the same x-axis:

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

x = [1,2,3]
y1 = [1,2,3]
y2 = [110,110,110]

ax.plot(x, y1, color="blue") # set line color to blue
ax.set_xlabel('X Axis')
ax.set_ylabel('Y1 Axis', color="blue") # set y axis title to blue
ax.tick_params(axis='y', colors="blue") # set y axis tick labels to blue

# We create another axis object. It shares the same x axis as ax, but the y-axis is separate.
ax2 = ax.twinx()
ax2.plot(x, y2, color="red") # set line color to red
ax2.set_ylabel('Y2 Axis', color="red") # set y axis title to red
ax2.tick_params(axis='y', colors="red") # set y axis tick labels to red

plt.show()

The output is as follows:

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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