# plot.nb

From spdep v0.6-9
by Roger Bivand

##### 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`

.

- Keywords
- spatial

##### 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

##### Examples

```
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)
```

*Documentation reproduced from package spdep, version 0.6-9, License: GPL (>= 2)*

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