aggregate.nb

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Aggregate a spatial neighbours object

The method aggregates a spatial neighbours object, creating a new object listing the neighbours of the aggregates.

Keywords
spatial
Usage
"aggregate"(x, IDs, remove.self = TRUE, ...)
Arguments
x
an nb neighbour object
IDs
a character vector of IDs grouping the members of the neighbour object
remove.self
default TRUE: remove self-neighbours resulting from aggregation
...
unused - arguments passed through
Value

an nb neighbour object

Note

Method suggested by Roberto Patuelli

Aliases
  • aggregate.nb
Examples
data(used.cars)
data(state)
cont_st <- match(attr(usa48.nb, "region.id"), state.abb)
cents <- as.matrix(as.data.frame(state.center))[cont_st,]
opar <- par(mfrow=c(2,1))
plot(usa48.nb, cents, xlim=c(-125, -65), ylim=c(25, 50))
IDs <- as.character(state.division[cont_st])
agg_cents <- aggregate(cents, list(IDs), mean)
agg_nb <- aggregate(usa48.nb, IDs)
plot(agg_nb, agg_cents[, 2:3], xlim=c(-125, -65), ylim=c(25, 50))
text(agg_cents[, 2:3], agg_cents[, 1], cex=0.6)
par(opar)
Documentation reproduced from package spdep, version 0.6-9, License: GPL (>= 2)

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