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
kclusters are produced or by cutting at heighth.- which, x
A vector selecting the clusters around which a rectangle should be drawn.
whichselects clusters by number (from left to right in the tree),xselects 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)
# NOT RUN {
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
# }