Version 3.1.2
matplotlib

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3D surface with polar coordinatesΒΆ

Demonstrates plotting a surface defined in polar coordinates. Uses the reversed version of the YlGnBu color map. Also demonstrates writing axis labels with latex math mode.

Example contributed by Armin Moser.

Traceback (most recent call last):
  File "/build/matplotlib-mO9dyQ/matplotlib-3.1.2/examples/mplot3d/surface3d_radial.py", line 1
    =================================
    ^
SyntaxError: invalid syntax
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3D surface with polar coordinates
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Demonstrates plotting a surface defined in polar coordinates.
Uses the reversed version of the YlGnBu color map.
Also demonstrates writing axis labels with latex math mode.

Example contributed by Armin Moser.
'''

# This import registers the 3D projection, but is otherwise unused.
from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import

import matplotlib.pyplot as plt
import numpy as np


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

# Create the mesh in polar coordinates and compute corresponding Z.
r = np.linspace(0, 1.25, 50)
p = np.linspace(0, 2*np.pi, 50)
R, P = np.meshgrid(r, p)
Z = ((R**2 - 1)**2)

# Express the mesh in the cartesian system.
X, Y = R*np.cos(P), R*np.sin(P)

# Plot the surface.
ax.plot_surface(X, Y, Z, cmap=plt.cm.YlGnBu_r)

# Tweak the limits and add latex math labels.
ax.set_zlim(0, 1)
ax.set_xlabel(r'$\phi_\mathrm{real}$')
ax.set_ylabel(r'$\phi_\mathrm{im}$')
ax.set_zlabel(r'$V(\phi)$')

plt.show()

Keywords: matplotlib code example, codex, python plot, pyplot Gallery generated by Sphinx-Gallery