Neighbours list based on \(k\) nearest neighbours

Step 2:

nb4 <- knn2nb(knn_centroids)
head(nb4)

## [[1]]
## [1] 2 3 4
## 
## [[2]]
## [1] 1 4 8
## 
## [[3]]
## [1] 1 4 5
## 
## [[4]]
## [1] 2 7 8
## 
## [[5]]
## [1]  3  8 11
## 
## [[6]]
## [1]  5  9 10