Differences between neighbours lists
The function finds differences between lists of neighbours, returning a nb neighbour list of those found
diffnb(x, y, verbose=NULL)
x |
an object of class |
y |
an object of class |
verbose |
default NULL, use global option value; report regions ids taken from object attribute "region.id" with differences |
A neighbours list with class nb
Roger Bivand Roger.Bivand@nhh.no
columbus <- st_read(system.file("shapes/columbus.shp", package="spData")[1], quiet=TRUE)
coords <- st_centroid(st_geometry(columbus), of_largest_polygon=TRUE)
rn <- row.names(columbus)
knn1 <- knearneigh(coords, 1)
knn2 <- knearneigh(coords, 2)
nb1 <- knn2nb(knn1, row.names=rn)
nb2 <- knn2nb(knn2, row.names=rn)
diffs <- diffnb(nb2, nb1)
opar <- par(no.readonly=TRUE)
plot(st_geometry(columbus), border="grey", reset=FALSE,
main="Plot of first (black) and second (red)\nnearest neighbours")
plot(nb1, coords, add=TRUE)
plot(diffs, coords, add=TRUE, col="red", lty=2)
par(opar)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.