Stacked Bar Chart with Centered Labels
Problem:
Attempting to center data labels in a stacked bar chart can be challenging, as simply centering the labels may not yield perfect results.
Solution 1: Pandas Bar Plot with bar_label()
- Utilize the pandas.DataFrame.plot.bar() or pandas.DataFrame.plot(kind='bar', stacked=True) methods.
- Use the matplotlib.pyplot.bar_label() function to automatically center the labels in the bars.
Solution 2: Explicit Labeling with Rectangle Properties
- Access the matplotlib.patches.Rectangle objects for each section using ax.patches.
- Calculate the height, width, x-coordinate, and y-coordinate for each rectangle.
- Create a label using f-strings, including additional text if desired.
- Plot the labels using ax.text(), aligning them in the center of the corresponding rectangles.
Solution 3: Seaborn Histplot
- Convert the dataframe to a long form using pandas.melt().
- Plot using seaborn.histplot() or seaborn.displot() with the parameters multiple='stack' and discrete=True.
- Access the patches using ax.containers and proceed with label creation and placement as in Solution 2.
Solution Notes:
- Customize labels for small segments by using ax.bar_label(c, labels=labels, label_type='center'), where labels is a list of labels corresponding to each rectangle.
- Use fmt=lambda x: f'{x:.0f}' to display numbers without decimal places in Solution 1.
- For horizontal stacked bars, use kind='barh' in pandas.plot() and modify the label calculation accordingly.
The above is the detailed content of How to Center Data Labels in Stacked Bar Charts?. For more information, please follow other related articles on the PHP Chinese website!