is.binary.tree: Test for Binary Tree
In gjuggler/ape: Analyses of Phylogenetics and Evolution

Description Usage Arguments Value Author(s) See Also Examples

This function tests whether a phylogenetic tree is binary, i.e. whether every node (including the root node) has exactly two descendant nodes. In this case the number of edges in the tree equals 2 n - 2 where n is the number of taxa (tips) in the tree.

1	is.binary.tree(phy)

phy

phylogenetic tree (i.e. an object of class "phylo").

is.binary.tree returns TRUE if tree is a fully binary phylogenetic tree, otherwise it returns FALSE.

Korbinian Strimmer (http://www.stat.uni-muenchen.de/~strimmer/)

read.tree, is.ultrametric, multi2di

data("hivtree.newick") # example tree in NH format
tree.hiv <- read.tree(text = hivtree.newick) # load tree

is.binary.tree(tree.hiv)

plot(tree.hiv)

unlink("hivtree.phy") # delete the file "hivtree.phy"