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Drawing error bars in Matplotlib

Programming
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Python
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Matplotlib
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Graphs Cookbook
schedule Jul 1, 2022
Last updated
local_offer PythonMatplotlib
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tocTable of Contents
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To draw error bars in Matplotlib, use the plt.errorbar(~) method, like so:

import matplotlib.pyplot as plt

x = [1,2,3]
y = [4,6,10]
yerr = [2,6,10]
plt.errorbar(x, y, yerr, fmt=".k")

Some notes about the method:

  • the fmt is needed here, otherwise there will be a solid line connecting the data points.

  • the yerr parameter is the vertical margin of the error:

The output is as follows:

Custom styling

To spice up our plot, set some optional parameters:

x = [1,2,3]
y = [4,6,10]
yerr = [2,6,10]
plt.errorbar(x, y, yerr, fmt=".k", capsize=5, ecolor="red", elinewidth=3)

This gets you the following:

Add error bar to Bar Chart

We can also add error bars to a bar chart by providing the yerr keyword argument:

x = [1,2,3]
y = [4,6,10]
error = [0.5,1,3]

plt.bar(x, y, yerr=error)
plt.show()

This produces the following output:

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Published by Isshin Inada
Edited by 0 others
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