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ed simply calculates euclidean distance between two points defined by their (x; y) coordinates.
ed
ed(pt1, pt2)
(x; y) coordinates of the first point.
(x; y) coordinates of the second point.
Returns the euclidean distance between the two points.
edm, edm_nearest, dist.
# NOT RUN { ed(c(0,1), c(1,0)) # }
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