【体】两空间向量的夹角

更新于
已知两空间向量，求其组成的夹角。
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import numpy as np

def angle(ab, cd):
    point_a, point_b = ab
    point_c, point_d = cd

    L_ab = np.sqrt((point_b-point_a).dot(point_b-point_a))
    L_cd = np.sqrt((point_d-point_c).dot(point_d-point_c))

    cos_angle = (point_b-point_a).dot(point_d-point_c)/(L_ab*L_cd)

    angle = np.arccos(cos_angle)
    angle2 = angle*360/2/np.pi

    return angle2

a = np.array([0,0,0])
b = np.array([0,1,0])
c = np.array([1,0,0])

print(angle([b, a], [a, c]))
0%