compute_psi

sknano.core.structures.compute_psi(*Ch)

Compute rotation component of symmetry operation $\psi$ in radians.

$$\psi = \frac{2\pi}{N}$$

Parameters:*Ch –

Either a 2-tuple of ints or 2 integers giving the chiral indices of the nanotube chiral vector $\mathbf{C}_h = n\mathbf{a}_1 + m\mathbf{a}_2 = (n, m)$.

Returns:Rotation component of symmetry operation $\psi$ in radians. Return type:float