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# sknano.structures.compute_d¶

sknano.structures.compute_d(*Ch)[source][source]

Compute $$d=\gcd{(n, m)}$$

$$d$$ is the Greatest Common Divisor of $$n$$ and $$m$$.

Parameters: *Ch : {tuple or ints} Either a 2-tuple of ints or 2 integers giving the chiral indices of the nanotube chiral vector $$\mathbf{C}_h = n\mathbf{a}_1 + m\mathbf{a}_2 = (n, m)$$. gcd : int Greatest Common Divisor of $$n$$ and $$m$$