The function calculates the cosine of the angle between two vectors, defined as the inner product of the vectors divided by the product of their euclidean norms
a vector, of the same length of
The cosine of the angle between the two vectors
Alessandro Barbiero, Giancarlo Manzi, Pier Alda Ferrari
Ferrari P.A., Annoni P., Barbiero A., Manzi G. (2011) An imputation method for categorical variables with application to nonlinear principal component analysis, Computational Statistics & Data Analysis, vol. 55, issue 7, pages 2410-2420, http://www.sciencedirect.com/science/article/pii/S0167947311000521
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