plot.nb {spdep}R Documentation

Plot a neighbours list

Description

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.

Usage

plot.nb(x, coords, col="black", points=TRUE, add=FALSE, arrows=FALSE, length=0.1, ...)
plot.listw(x, coords, col="black", points=TRUE, add=FALSE, arrows=FALSE, length=0.1, ...)

Arguments

x an object of class nb or (for plot.listw) class listw
coords matrix of region point coordinates
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
... further graphical parameters as in par(..)

Author(s)

Roger Bivand Roger.Bivand@nhh.no

See Also

summary.nb

Examples

data(columbus)
plot(col.gal.nb, coords)
title(main="GAL order 1 links with first nearest neighbours in red")
col.knn <- knearneigh(coords, k=1)
plot(knn2nb(col.knn), coords, add=TRUE, col="red", length=0.08)

[Package spdep version 0.3-12 Index]