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Defining a discrete colormap for imshow in Matplotlib
To define a discrete colormap for imshow in matplotlib, we can take following the steps −
Create data using numpy.
Initialize the data using get_cmap, so that scatter knows.
Using imshow() method with colormap, display the data as an image, i.e., on a 2D regular raster.
Create the colorbar using the colorbar() method.
To display the figure, use the show() method.
Example
import numpy as np
from matplotlib import pyplot as plt
import matplotlib
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True
data = np.random.rand(10, 10)
cmap = matplotlib.cm.get_cmap('Paired_r', 10)
plt.imshow(data, cmap=cmap)
plt.colorbar()
plt.show()Output
Updated on: 09-Apr-2021
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