颤抖的3D向量保持静态

Question

I got the following code

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


fig = plt.figure()
ax = fig.gca(projection='3d')

ax.quiver(0,0,0,10, 0, 0, pivot='tail')

ax.set_xlim3d(-2, 5)
ax.set_ylim3d(-2, 2)
ax.set_zlim3d(-2, 2)

plt.grid()
plt.draw()
plt.show()

Running this never changes the length of the vector in the x-direction. It seems to be stuck by 1. Any idea how I could draw the vector r = (10,0,0)? I also tried to use scale, scale_units, and angles but without success. It just kept on complaining that these attributes do not exist. FYI, this is only a MWE.

Answer 1

This has been fixed three years ago via https://github.com/matplotlib/matplotlib/pull/5458 , which means it'll work as expected in matplotlib >= 2.0.
Also see API changes in 2.0 where it says

The 3D quiver function previously normalized the arrows to be the same length, which makes it unusable for situations where the arrows should be different lengths and does not match the behavior of the 2D function. This normalization behavior is now controlled with the normalize keyword, which defaults to False.