You may handle that as a list of "nb" objects.
library(spdep)
example(columbus)
coord <- coordinates(columbus)
z <- c(1,2,3,4,5,6,7,8,9)
neighbors.knn <- list()
for (val in z) {
neighbors.knn <- c(neighbors.knn, list(knn2nb(knearneigh(coord, val,
longlat=F), sym=F)))
}
class(neighbours.knn)
class(neighbors.knn[[1]])
plot(neighbors.knn[[1]], coord)
class(neighbors.knn[[2]])
plot(neighbors.knn[[2]], coord)
and so on.
Best,
--
GG
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