Canberra Distance Calculates the Canberra distance between two vectors. See http://en.wikipedia.org/wiki/Canberra_distance. Usage require 'canberra_distance' CanberraDistance.calculate([1, 1], [3, 7]) #=> 1.25 CanberraDistance.calculate([-1, 2, -3], [0, 0, -1]) #=> 2.5