`scipy.spatial.transform._rotation:Rotation.magnitude`

Signature

def magnitude(self) → Array

Get the magnitude(s) of the rotation(s).

magnitude : ndarray or float: Angle(s) in radians, float if object contains a single rotation and ndarray if object contains ND rotations. The magnitude will always be in the range [0, pi].

from scipy.spatial.transform import Rotation as R
import numpy as np
r = R.from_quat(np.eye(4))

✓

r.as_quat()
r.magnitude()

✗

array([3.14159, 3.14159, 3.14159, 0.     ])

Magnitude of a single rotation:

r[0].magnitude()

✗

np.float64(3.141592653589793)