importmatplotlib.pyplotaspltimportnumpyasnpax=plt.figure().add_subplot(projection='3d')# Make the gridx,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 arrowsu=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()

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