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rect.hclust {mva}R Documentation

Draw Rectangles Around Hierarchical Clusters

Description

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(hclust.obj, k=NULL, which=NULL, x=NULL, y=NULL,
            border=2, cluster=NULL)

Arguments

hclust.obj

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 height h.

which, x

A vector selecting the clusters around which a rectangle should be drawn. which seleccts clusters by number (from left to right in the tree), x selects clusters containing the respective horizontal coordinates. Default is which=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

hclust, identify.hclust

Examples

library(mva)
data(USArrests)
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