Graphs Cookbook

Drawing a bar chart Drawing a box plot Drawing a function Drawing a histogram Drawing a horizontal line Drawing a line plot Drawing a normal curve Drawing a scatterplot Drawing a single point Drawing a stacked bar chart Drawing a vertical line Drawing arrows Drawing circles Drawing empty circles Drawing error bars Drawing horizontal bar plots Drawing multiple histograms in one plot Normalizing a histogram Plotting scatter plot with category

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Drawing a stacked bar chart in Matplotlib

Programming

Python

Matplotlib

Cookbooks

Graphs Cookbook

Jul 1, 2022

Last updated

local_offer Python●Matplotlib

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()