Centroid

This function computes the centroid (or center of mass) of a set of x-y (or longitude-latitude) coordinates.

Usage

centroid(x, y, robust = FALSE, geo = FALSE)

Arguments

x

A vector of x (or longitude) coordinates.

y

A vector of y (or latitude) coordinates.

robust

A logical value indicating whether to compute the centroid as a simple average of the coordinates (FALSE, the default), or as the average of the coordinates weighted by the inverse of their mean pairwise distance to all other coordinates in the set (TRUE).

geo

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

Value

A two-element list corresponding to the location of the centroid.

See also

dist2centroid

Author

Simon Garnier, garnier@njit.edu

Examples

x <- rnorm(25)
y <- rnorm(25, sd = 3)
centroid(x, y)
#> $x
#> [1] 0.07305846
#> 
#> $y
#> [1] -0.326888
#>