rect.hclust
Draw Rectangles Around Hierarchical Clusters
Draws rectangles around the branches of a dendrogram highlighting the corresponding clusters. First the dendrogram is cut at a certain level, then a rectangle is drawn around selected branches.
Usage
rect.hclust(tree, k = NULL, which = NULL, x = NULL, h = NULL, border = 2, cluster = NULL)
Arguments
 tree
 an object of the type produced by
hclust
.  k, h
 Scalar. Cut the dendrogram such that either exactly
k
clusters are produced or by cutting at heighth
.  which, x
 A vector selecting the clusters around which a
rectangle should be drawn.
which
selects clusters by number (from left to right in the tree),x
selects clusters containing the respective horizontal coordinates. Default iswhich = 1:k
.  border
 Vector with border colors for the rectangles.
 cluster
 Optional vector with cluster memberships as returned by
cutree(hclust.obj, k = k)
, can be specified for efficiency if already computed.
Value

(Invisibly) returns a list where each element contains a vector of
data points contained in the respective cluster.
See Also
Examples
library(stats)
require(graphics)
hca < hclust(dist(USArrests))
plot(hca)
rect.hclust(hca, k = 3, border = "red")
x < rect.hclust(hca, h = 50, which = c(2,7), border = 3:4)
x
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