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How to add legend to imshow() in Matplotlib?
To add legend to imshow() in Matplotlib, we can take the following steps −
- Set the figure size and adjust the padding between and around the subplots.
- Create random data using numpy.
- Initialize a color map.
- Get the unique data points from sample data, step 2.
- Plot each color with different labels and color, to place on the legend.
- Place a legend at the upper right corner within a box.
- To display the figure, use show() method.
Example
import numpy as np from matplotlib import pyplot as plt, cm plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True data = np.random.rand(3, 3) cmap = cm.YlOrBr unique_data = np.unique(data) i = 0 for entry in unique_data: mycolor = cmap(entry * 255 / (max(unique_data) - min(unique_data))) plt.plot(0, 0, "-", color=mycolor, label="%d"%i) i += 1 plt.imshow(data, cmap=cmap) plt.legend(loc="upper right", bbox_to_anchor=(1.25, 1.0)) plt.show()
Output
Updated on: 18-Jun-2021
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