sknano.structures.compute_t2

sknano.structures.compute_t2(*Ch)

Compute $t_2 = -\frac{2n + m}{d_R}$

where $d_R = \gcd{(2n + m, 2m + n)}$.

The component of the translation vector $\mathbf{T}$ along $\mathbf{a}_2$:

$$\mathbf{T} = t_1\mathbf{a}_1 + t_2\mathbf{a}_2$$

Parameters:

*Ch : {tuple or ints}

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:

int

$t_2$