subtrees

Takes a subtree of a dendrogram object such as generated by hclust according to a prespecified number of clusters or a prespecified height.

subtree(tree, k = NULL, h = NULL)

Arguments

tree	The tree object which contains the attributes merge and height in the same way as an hclust object.
k	The number of clusters at which to cut.
h	The height at which to cut.

Details

Does the same as cutree with two differences: Firstly it gives back an entire tree object, i.e. an object with attributes merge, height, labels and order, as well as data, which contains the cluster ids. Secondly the cluster ids are chosen by the heights at which the clusters were built.

Value

An hclust object.

See also

cutree

Examples

hc <- hclust(dist(USArrests), "ave")

hcs <- subtree(hc, k = 7)
hcs2 <- subtree(hc, h= 30)

attributes(hcs)
#> $names
#> [1] "merge"  "order"  "labels" "data"   "height"
#> 
#> $class
#> [1] "hclust"
#> 
fluctile(table(hcs$data, cutree(hc, k=7)))
#> viewport[base] 

par(mfrow=c(1,3))
plot(hc)
plot(hcs)
plot(hcs2)