Nothing
get.neighbor <- function(map, regions) {
if (!inherits(map, "gra"))
stop("Argument 'map' is not an object of class 'gra'!")
districts <- rownames(map)
neighbors <- list(length = length(regions))
for (i in 1:length(regions)) {
ind <- which(districts == regions[i])
neighbors[[i]] <- districts[map[ind, ] == -1]
}
names(neighbors) <- regions
return(neighbors)
}
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