nb.set.operations

0th

Percentile

Set operations on neighborhood objects

Set operations on neighbors list objects

Keywords
spatial
Usage
intersect.nb(nb.obj1,nb.obj2) union.nb(nb.obj1,nb.obj2) setdiff.nb(nb.obj1,nb.obj2) complement.nb(nb.obj)
Arguments
nb.obj
a neighbor list created from any of the neighborhood list funtions
nb.obj1
a neighbor list created from any of the neighborhood list funtions
nb.obj2
a neighbor list created from any of the neighborhood list funtions
Details

These functions perform set operations on each element of a neighborlist. The arguments must be neighbor lists created from the same coordinates, and the region.id attributes must be identical.

Value

See Also

intersect.nb, union.nb, setdiff.nb

Aliases
  • intersect.nb
  • union.nb
  • setdiff.nb
  • complement.nb
Examples
example(columbus)
coords <- coordinates(columbus)
col.tri.nb <- tri2nb(coords)
oldpar <- par(mfrow=c(1,2))
col.soi.nb <- graph2nb(soi.graph(col.tri.nb, coords))
plot(columbus, border="grey")
plot(col.soi.nb, coords, add=TRUE)
title(main="Sphere of Influence Graph")
plot(columbus, border="grey")
plot(complement.nb(col.soi.nb), coords, add=TRUE)
title(main="Complement of Sphere of Influence Graph")
par(mfrow=c(2,2))
col2 <- droplinks(col.gal.nb, 21)
plot(intersect.nb(col.gal.nb, col2), coords)
title(main="Intersect")
plot(union.nb(col.gal.nb, col2), coords)
title(main="Union")
plot(setdiff.nb(col.gal.nb, col2), coords)
title(main="Set diff")
par(oldpar)
Documentation reproduced from package spdep, version 0.6-9, License: GPL (>= 2)

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