spatstat (version 1.3-4)

pairdist: Pairwise distances

Description

Computes the matrix of distances between all pairs of points in a point pattern.

Usage

pairdist(x, y=NULL, method="C")

Arguments

x,y

Arguments specifying the $x$ and $y$ coordinates of a set of points. Typically x and y would be numeric vectors of equal length. Alternatively y may be omitted and x may be a point patter

method

String specifying which method of calculation to use. Values are "C" and "interpreted".

Value

• A square matrix whose [i,j] entry is the distance between the points numbered i and j.

Details

This function computes the Euclidean distances between all pairs of points, and returns the matrix of distances.

If method = "interpreted" then the distances are computed using interpreted R code only. If method="C" then C code is used. The C code is marginally faster.

See Also

nndist, Kest

Examples

x <- runif(100)
   y <- runif(100)
   d <- pairdist(x, y)
   data(cells)
   d <- pairdist(cells)