order_outsidein {GPvecchia}

Outside-in ordering

Description

Return the ordering of locations decreasing in their distance to the average location. Reverses middleout.

Usage

order_outsidein(locs, lonlat = FALSE)

Arguments

locs

A matrix of locations. Each row of locs contains a location, which can be a point in Euclidean space R^d, a point in space-time R^d x T, a longitude and latitude (in degrees) giving a point on the sphere, or a longitude, latitude, and time giving a point in the sphere-time domain.

lonlat

TRUE/FALSE whether locations are longitudes and latitudes.

Value

A vector of indices giving the ordering, i.e. the first element of this vector is the index of the location farthest from the center.

Examples

n <- 100             # Number of locations
d <- 2               # dimension of domain
locs <- matrix( runif(n*d), n, d )
ord <- order_outsidein(locs)