[Solved] matplotlib don’t show the correct vector

Kobbo Asks: matplotlib don’t show the correct vector
I’m new to python and learn to plot graph with matplotlib. I try to plot vector that point from (0, 0) to (2, 1).

import matplotlib.pyplot as plt

O = [0, 0]
V = [2, 1]

plt.quiver(O[0], O[1], V[0], V[1], units='xy', scale=1, color='r')

plt.xlim(-3, 3)
plt.ylim(-3, 3)


I don’t know why but

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my vector plot

thank you very much.

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