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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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To draw error bars in Matplotlib, use the `plt.errorbar(~)` method, like so:

``` import matplotlib.pyplot as pltx = [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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