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# sknano.structures.compute_M¶

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

Compute $$M = mp - nq$$

$$M$$ is the number of multiples of the translation vector $$\mathbf{T}$$ in the vector $$N\mathbf{R}$$.

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