Nearest Neihgbor Distance

Given the locations of different objects, this function determines the distance of the nearest neighboring object to each object.

Usage

nnd(x, y, geo = FALSE)

Arguments

x

A vector of x (or longitude) coordinates.

y

A vector of y (or latitude) coordinates.

geo

A logical value indicating whether the locations are defined by geographic coordinates (pairs of longitude/latitude values). Default: FALSE.

Value

A vector of the same length as x and y representing the distance to the nearest neighboring object for each object.

See also

nn

Author

Simon Garnier, garnier@njit.edu

Examples

x <- rnorm(25)
y <- rnorm(25, sd = 3)
id <- 1:25
nnd(x, y)
#>         1         2         3         4         5         6         7         8 
#> 1.2076390 0.6071440 0.3208842 0.7446473 0.5268938 0.6071440 0.3208842 0.8663278 
#>         9        10        11        12        13        14        15        16 
#> 1.2076390 1.5719917 1.5719917 0.4417309 0.7373362 1.1673389 0.8942101 0.3615706 
#>        17        18        19        20        21        22        23        24 
#> 1.0906929 0.7766914 1.1461802 0.4160779 0.4417309 1.1461802 0.4160779 0.3615706 
#>        25 
#> 0.7373362