Calculates the distance matrix of points on the surface of a torus.
dist.torus(coors) Complete distance matrix with diagonal and upper triangle values.
data.frame or matrix with two
columns with x- and y-coordinates.
A rectangular plane is considered as torus (i.e. on an endless plane that contimues on the left, when leaving at the right side, and in the same way connects top and bottom border). Distances between two points on the plane are calculated as the shortest distance between the points on the torus surface.