R: Rotate tree branches for k

all_couple_rotations_at_k {dendextend} | R Documentation

## Rotate tree branches for k

### Description

Given a tree and a k number of clusters, the tree is rotated so that the extra clusters added from k-1 to k clusters are flipped.

This is useful for finding good trees for a tanglegram.

### Usage

    all_couple_rotations_at_k(dend, k, dend_heights_per_k, ...)

### Arguments

`dend` | a dendrogram object
`k` | integer scalar with the number of clusters the tree should be cut into.
`dend_heights_per_k` | a named vector that resulted from running heights_per_k.dendrogram. When running the function many times, supplying this object will help improve the running time if using the cutree.dendrogram method..
`...` | not used

### Value

A list with dendrogram objects with all the possible rotations for k clusters (beyond the k-1 clusters!).

### See Also

tanglegram, match_order_by_labels, entanglement, flip_leaves.

### Examples

    ## Not run:
    dend1 <- USArrests[1:5,] %>% dist %>% hclust %>% as.dendrogram
    dend2 <- all_couple_rotations_at_k(dend1, k=2)[[2]]
    tanglegram(dend1,dend2)
    entanglement(dend1,dend2, L = 2) # 0.5

    dend2 <- all_couple_rotations_at_k(dend1, k=3)[[2]]
    tanglegram(dend1,dend2)
    entanglement(dend1,dend2, L = 2) # 0.4

    dend2 <- all_couple_rotations_at_k(dend1, k=4)[[2]]
    tanglegram(dend1,dend2)
    entanglement(dend1,dend2, L = 2) # 0.05

    ## End(Not run)

[Package dendextend version 1.8.0 Index]