Time for action – plotting in three dimensions

We will plot a simple three-dimensional function:

Time for action – plotting in three dimensions
  1. Use the 3D keyword to specify a three-dimensional projection for the plot:
    ax = fig.add_subplot(111, projection='3d')
  2. To create a square two-dimensional grid, use the meshgrid() function to initialize the x and y values:
    u = np.linspace(-1, 1, 100)

x, y = np.meshgrid(u, u)
  3. We will specify the row strides, column strides, and the color map for the surface plot. The strides determine the size of the tiles in the surface. The choice for color map is a matter of taste:
    ax.plot_surface(x, y, z,  rstride=4, cstride=4, cmap=cm.YlGnBu_r)

    The result is the following three-dimensional plot:

    Time for action – plotting in three dimensions

What just happened?

We created a plot of a three-dimensional function (see three_d.py):

from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
from matplotlib import cm

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')

u = np.linspace(-1, 1, 100)

x, y = np.meshgrid(u, u)
z = x ** 2 + y ** 2
ax.plot_surface(x, y, z,  rstride=4, cstride=4, cmap=cm.YlGnBu_r)

plt.show()
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