spatstat (version 1.3-1)

nndist: Nearest neighbour distances

Description

Computes the distance from each point to its nearest neighbour in a point pattern.

Usage

nndist(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

• Numeric vector of the nearest neighbour distances for each point.

Details

This function computes the Euclidean distance from each point in a point pattern to its nearest neighbour (the nearest other point of the pattern).

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 faster by two to three orders of magnitude and uses much less memory.

See Also

pairdist, Gest

Examples

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

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