Cherry number

Finds the number of cherries in a tree. A cherry is considered to be a pair of sister tips.

cherries(tree, normalise = FALSE)

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.

normalise

option to normalise the result, default is FALSE.

Value

An integer representing the number of cherries in the tree.

See also

configShow

Author

Michelle Kendall michelle.louise.kendall@gmail.com

Examples

## Find the number of cherries in a random tree with 10 tips:
tree <- rtree(10)
plot(tree)

cherries(tree)
#> [1] 3
# and the normalised cherry number:
cherries(tree, normalise=TRUE)
#> [1] 0.6

## Note that the function configShow can be used to highlight the cherries in the tree:
configShow(tree, 2, edge.width=2)