Plot a neighbours list
A function to plot a neighbours list given point coordinates to represent the region in two dimensions; plot.listw is a wrapper that passes its neighbours component to plot.nb.
## S3 method for class 'nb' plot(x, coords, col="black", points=TRUE, add=FALSE, arrows=FALSE, length=0.1, xlim=NULL, ylim=NULL, ...) ## S3 method for class 'listw' plot(x, coords, col="black", points=TRUE, add=FALSE, arrows=FALSE, length=0.1, xlim=NULL, ylim=NULL, ...)
x |
an object of class |
coords |
matrix of region point coordinates, a |
col |
plotting colour |
points |
(logical) add points to plot |
add |
(logical) add to existing plot |
arrows |
(logical) draw arrowheads for asymmetric neighbours |
length |
length in plot inches of arrow heads drawn for asymmetric neighbours lists |
xlim, ylim |
plot window bounds |
... |
further graphical parameters as in |
Roger Bivand Roger.Bivand@nhh.no
columbus <- st_read(system.file("shapes/columbus.shp", package="spData")[1], quiet=TRUE)
col.gal.nb <- read.gal(system.file("weights/columbus.gal", package="spData")[1])
plot(col.gal.nb, st_geometry(columbus))
title(main="GAL order 1 links with first nearest neighbours in red", cex.main=0.6)
plot(col.gal.nb, as(columbus, "Spatial"))
title(main="GAL order 1 links with first nearest neighbours in red", cex.main=0.6)
coords <- st_centroid(st_geometry(columbus), of_largest_polygon=TRUE)
col.knn <- knearneigh(coords, k=1)
plot(knn2nb(col.knn), coords, add=TRUE, col="red", length=0.08)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.