Node imbalance

For a given node, this function gives the number of tips descending from each of its two children, as a measure of imbalance.

nodeImb(tree, node)

Arguments

tree

a tree of class phylo or phylo4. The tree should be binary and rooted; if not it will be coerced into a binary rooted tree using multi2di, if possible.

node

a node index between 1 and 2n-1, where n is the number of tips in the tree.

Value

Two integers corresponding to the number of tip descendants of each of the node's two children. If the node is itself a tip, then the vector (0,0) will be returned.

See also

treeImb

Author

Michelle Kendall michelle.louise.kendall@gmail.com

Examples

## Find the imbalance of node 16 in a random tree with 10 tips:
tree <- rtree(10)
plot(tree)
nodelabels()

nodeImb(tree,16)
#> [1] 1 2