geoR (version 1.6-21)

nearloc: Near location to a point

Description

For a given set of points and locations identified by 2D coordinates this function finds the nearest location of each point

Usage

nearloc(points, locations, positions = FALSE)

Arguments

points

a matrix, data-frame or list with the 2D coordinates of a set of points for which you want to find the nearest location.

locations

a matrix, data-frame or list with the 2D coordinates of a set of locations.

positions

logical defining what to be returned. If TRUE the function returns the positions of the locations, otherwise the coordinates of the locations. Defaults to FALSE.

Value

• If positions = FALSE the function returns a matrix, data-frame or list of the same type and size as the object provided in the argument points with the coordinates of the nearest locations.

  If positions = FALSE the function returns a vector with the position of the nearest points in the locations object.

See Also

loccoords

Examples

set.seed(276)
gr <- expand.grid(seq(0,1, l=11), seq(0,1, l=11))
plot(gr, asp=1)
pts <- matrix(runif(10), nc=2)
points(pts, pch=19)
near <- nearloc(points=pts, locations=gr)
points(near, pch=19, col=2)
rownames(near)
nearloc(points=pts, locations=gr, pos=TRUE)