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Drawing a horizontal line in Matplotlib

Programming
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Python
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Matplotlib
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Cookbooks
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Graphs Cookbook
schedule Mar 10, 2022
Last updated
local_offer PythonMatplotlib
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To draw a horizontal line in Matplotlib, use the axhline(~) function like so:

plt.axhline(y=0.5)

The output is as follows:

Changing the color

To change color of the line, add the color parameter:

color="red"
color="#FF0000"

Changing the line style

To change the styling of the line, add the linestyle parameter:

linestyle="dotted"
linestyle="dashed"

Specifying the starting and endpoint points

By default, the line drawn by axhline(~) spans the entire width of the graph.

xmin and xmax

You could change this behavior by specifying parameters xmin and xmax, both of which must be a number between 0 and 1.Here, 0 represents the left-side of your graph, while 1 represents the right-side of your graph.

To draw a horizontal line from left 25% to right 75%:

plt.xlim(0, 10)
plt.axhline(y=2, xmin=0.25, xmax=0.75)

The output is as follows:

x-coordinates

Unfortunately, the axhline(~) method does not accept starting and ending x-coordinates. We can instead resort to the plt.plot(~) function, which does allow for x-coordinates.

To draw a horizontal line from x=2 to x=8 at y=5:

plt.xlim(0, 10)
plt.plot([2,8], [5,5])

The output is as follows:

robocat
Published by Isshin Inada
Edited by 0 others
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