Test for Binary Tree
This function tests whether a phylogenetic tree is binary.
- an object of class
The test differs slightly whether the tree is rooted or not. An urooted tree is considered binary if all its nodes are of degree three (i.e., three edges connect to each node). A rooted tree is considered binary if all nodes (including the root node) have exactly two descendant nodes, so that they are of degree three expect the root which is of degree 2.
treeis a fully binary phylogenetic tree, otherwise it returns
data("hivtree.newick") # example tree in NH format tree.hiv <- read.tree(text = hivtree.newick) is.binary.tree(tree.hiv) plot(tree.hiv)