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Drawing a stacked bar chart 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 Jul 1, 2022
Last updated
local_offer PythonMatplotlib
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To draw stacked bar charts in Matplotlib we can use the ax.bar(~) method.

Examples

To draw a stacked bar chart of favorite colors of primary school, intermediate, and high school students:

fig, ax = plt.subplots()

colors = ["Blue", "Red", "Green"]

#Numpy arrays containing number of students with each favorite color
primary = np.array([1,2,3]) #number of students with fav color [blue, red, green]
intermediate = np.array([2,3,1])
high_school = np.array([3,2,1])

#Add the bars. The bottom argument specifies where to start to stack the bar.
ax.bar(colors, primary, label="primary")
ax.bar(colors, intermediate, bottom=primary, label="intermediate")
ax.bar(colors, high_school, bottom=primary + intermediate, label="high school")

#Set the x tick labels and the y-axis label
ax.set_xticklabels(colors, rotation=90)
ax.set_ylabel("# of Students")

#Add a legend
ax.legend()

#Show the plot
plt.show()

This produces the following output:

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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