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spdep (version 0.6-9)

plot.nb: 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"(x, coords, col="black", points=TRUE, add=FALSE, arrows=FALSE, length=0.1, xlim=NULL, ylim=NULL, ...)
"plot"(x, coords, col="black", points=TRUE, add=FALSE, arrows=FALSE, length=0.1, xlim=NULL, ylim=NULL, ...)

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
xlim, ylim
plot window bounds
...
further graphical parameters as in par(..)

See Also

summary.nb

Examples

Run this code
example(columbus)
coords <- coordinates(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)

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