python-matplotlibHow to draw 3D vector

Usage example

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.quiver(0, 0, 0, 1, 2, 1)
ax.set_xlim([-1, 4])
ax.set_ylim([-1, 4])
ax.set_zlim([-1, 4])
plt.show()