precess_mat

diffsims.utils.atomic_diffraction_generator_utils.precess_mat(alpha, theta)

Generates rotation matrices for precession curves.

Parameters:

alphafloat

Angle (in degrees) of precession tilt

thetafloat

Angle (in degrees) along precession curve

Returns:

Rnumpy.ndarray [float], (3, 3)

Rotation matrix associated to the tilt of alpha away from the vertical axis and a rotation of theta about the vertical axis.