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# 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()

Total running time of the script: ( 0 minutes 0.027 seconds)

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