sknano.structures.compute_dR

sknano.structures.compute_dR(*Ch)

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

$d_R$ is the Greatest Common Divisor of $2n + m$ and $2m + n$.

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

greatest common divisor of $2n+m$ and $2m+n$