Perform a toroidal shift on a point data set
tor.shift(pts,xsh=0.0,ysh=0.0,rect)The point data set to shift
Amount to shift along the x-axis
Amount to shift along the y-axis
A rectangle defining the region for the toroidal map. If not given,
the bounding box of pts is used.
A point data set like pts, but after application of a toroidal
shift along the x and y axes.
The planar region defined by rect
is assumed connected at its top and bottom edges, and at its left and
right sides. A shift of xsh and ysh is applied to the
points and the resulting set of points returned.
Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19, 627-655; the original sources can be accessed at: http://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307-317.