Neighbours list based on distance bounds
nb3 <- dnearneigh(x = centroids, d1 = 0, d2 = 0.4)
## Warning in dnearneigh(x = centroids, d1 = 0, d2 = 0.4): neighbour object has 18
## sub-graphs
## [[1]]
## [1] 0
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## [[2]]
## [1] 4
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## [[3]]
## [1] 0
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## [[4]]
## [1] 2 8
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## [[5]]
## [1] 0
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## [[6]]
## [1] 0