knn2nb {spdep}R Documentation

Neighbours list from knn object

Description

The function converts a knn object returned by knearneigh into a neighbours list of class nb with a list of integer vectors containing neighbour region number ids.

Usage

knn2nb(knn, row.names = NULL, sym = FALSE)

Arguments

knn A knn object returned by knearneigh
row.names character vector of region ids to be added to the neighbours list as attribute region.id, default seq(1, nrow(x))
sym force the output neighbours list to symmetry

Value

The function returns an object of class nb with a list of integer vectors containing neighbour region number ids.

Author(s)

Roger Bivand Roger.Bivand@nhh.no

See Also

knearneigh

Examples

data(columbus)
col.knn <- knearneigh(coords, k=4)
library(maptools)
plot(polys, border="grey", forcefill=FALSE)
plot(knn2nb(col.knn), coords, add=TRUE)
title(main="K nearest neighbours, k = 4")

[Package spdep version 0.3-12 Index]