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
phyloorphylo4. 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
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)
