splancs (version 2.01-16)

tor.shift: Toroidal shift on a point data set

Description

Perform a toroidal shift on a point data set

Usage

tor.shift(pts,xsh=0.0,ysh=0.0,rect)

Arguments

pts

The point data set to shift

xsh

Amount to shift along the x-axis

ysh

Amount to shift along the y-axis

rect

A rectangle defining the region for the toroidal map. If not given, the bounding box of pts is used.

Value

• A point data set like pts, but after application of a toroidal shift along the x and y axes.

Details

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.

References

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.

See Also

shift