Reorder a dendrogram

Description

There are many different orderings of a dendrogram that are consistent with the structure imposed. This function takes a dendrogram and a vector of values and reorders the dendrogram in the order of the supplied vector, maintaining the constraints on the dendrogram.

Usage

reorder(x, ...)

## S3 method for class 'dendrogram':
reorder(x, wts, ...)

Arguments

Details

Using the weights wts, the leaves of the dendrogram are reordered so as to be in an order as consistent as possible with the weights. Afterward, at each node, the branches are ordered in increasing weights (where the weight of a branch is defined as the sum of the weights of its sub branches).

Value

From reorder.dendrogram a dendrogram, where each node has a further attribute value with its corresponding weight.

Author(s)

R. Gentleman

See Also

heatmap, cophenetic

Examples

  set.seed(123)
  x <- rnorm(10)
  hc <- hclust(dist(x))
  dd <- as.dendrogram(hc)
  dd.reorder <- reorder(dd, 10:1)

  op <- par(mfcol = 1:2)
  plot(dd, main = "random dendrogram `dd'")
  plot(dd.reorder, main = "reorder(dd, 10:1)")
  par(op)