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Drawing a stacked bar chart in Matplotlib
schedule Aug 12, 2023
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Tags Python●Matplotlib
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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 colorprimary = 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 labelax.set_xticklabels(colors, rotation=90)ax.set_ylabel("# of Students")
#Add a legendax.legend()
#Show the plotplt.show()
This produces the following output:
Published by Arthur Yanagisawa
Edited by 0 others
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