How to apply a mask on the matrix in Matplotlib imshow?

To apply a mask on the matrix in matplotlib imshow(), we can use np.ma.masked_where() method with lower and upper limit.

Steps

Initialize two variables, l and u, to mask the input matrix.
Create random data of 5×5 dimension.
Mask the input matrix, lower of l value, and above of u.
Create a figure and a set of subplots with nrows=1 and ncols=
Display the data as an image, i.e., on a 2D regular raster, at axes 0 and
Set the title of the axes, 0 and
To display the figure, use show() method.

Example

import numpy as np
import matplotlib.pyplot as plt

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

l = 0.125
u = 0.575

data = np.random.rand(5, 5)
data = np.ma.masked_where((l < data) & (data < u), data)

fig, axs = plt.subplots(1, 2)

axs[0].imshow(data.data)
axs[0].set_title("Without Masked")
axs[1].imshow(data)
axs[1].set_title("With Masked")

plt.show()

Output

Rishikesh Kumar Rishi

Updated on 03-Aug-2021 13:26:27

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