Plotting a masked surface plot using Python, Numpy and Matplotlib

To plot a masked surface plot using Python, Numpy and Matplotlib, we can take the following steps −

Set the figure size and adjust the padding between and around the subplots.
Create a new figure or activate an existing figure.
Add an 'ax' to the figure as part of a subplot arrangement.
Return the coordinate matrices from coordinate vectors, pi and theta.
Create x, y and z with masked data points.
Create a surface plot with x, y, and z data points.
To display the figure, use show() method.

Example

import matplotlib.pyplot as plt
import numpy as np

plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True

fig = plt.figure()
ax = fig.add_subplot(111, projection="3d")
pi, theta = np.meshgrid(
   np.arange(1, 10, 2) * np.pi / 4,
   np.arange(1, 10, 2) * np.pi / 4)

x = np.cos(pi) * np.sin(theta)
y = np.sin(pi) * np.sin(theta)
z = np.ma.masked_where(x >= 0.01, y)

ax.plot_surface(x, y, z, color='red')

plt.show()