.. _mplot3d-quiver3d_demo: mplot3d example code: quiver3d_demo.py ====================================== .. plot:: /home/tcaswell/src/p/matplotlib/doc/mpl_examples/mplot3d/quiver3d_demo.py :: ''' ============== 3D quiver plot ============== Demonstrates plotting directional arrows at points on a 3d meshgrid. ''' from mpl_toolkits.mplot3d import axes3d import matplotlib.pyplot as plt import numpy as np fig = plt.figure() ax = fig.gca(projection='3d') # Make the grid x, y, z = np.meshgrid(np.arange(-0.8, 1, 0.2), np.arange(-0.8, 1, 0.2), np.arange(-0.8, 1, 0.8)) # Make the direction data for the arrows u = np.sin(np.pi * x) * np.cos(np.pi * y) * np.cos(np.pi * z) v = -np.cos(np.pi * x) * np.sin(np.pi * y) * np.cos(np.pi * z) w = (np.sqrt(2.0 / 3.0) * np.cos(np.pi * x) * np.cos(np.pi * y) * np.sin(np.pi * z)) ax.quiver(x, y, z, u, v, w, length=0.1, normalize=True) plt.show() Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)