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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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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 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:

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