order.dendrogram {stats}

R Documentation

Ordering or Labels of the Leaves in a Dendrogram

Description

Theses functions return the order (index) or the "label" attribute for the leaves in a dendrogram. These indices can then be used to access the appropriate components of any additional data.

Usage

order.dendrogram(x)

## S3 method for class 'dendrogram'
labels(object, ...)

Arguments

x, object	a dendrogram (see as.dendrogram).
...	additional arguments

Details

The indices or labels for the leaves in left to right order are retrieved.

Value

A vector with length equal to the number of leaves in the dendrogram is returned. From r <- order.dendrogram(), each element is the index into the original data (from which the dendrogram was computed).

Author(s)

R. Gentleman (order.dendrogram) and Martin Maechler (labels.dendrogram).

See Also

reorder, dendrogram.

Examples

Run examples

set.seed(123)
x <- rnorm(10)
hc <- hclust(dist(x))
hc$order
dd <- as.dendrogram(hc)
order.dendrogram(dd) ## the same :
stopifnot(hc$order == order.dendrogram(dd))

d2 <- as.dendrogram(hclust(dist(USArrests)))
labels(d2) ## in this case the same as
stopifnot(identical(labels(d2),
   rownames(USArrests)[order.dendrogram(d2)]))

---