Pairwise Distances from a Phylogenetic Tree
cophenetic.phylo computes the pairwise distances between the
pairs of tips from a phylogenetic tree using its branch lengths.
dist.nodes does the same but between all nodes, internal and
terminal, of the tree.
## S3 method for class 'phylo': cophenetic(x) dist.nodes(x)
a numeric matrix with colnames and rownames set to the names of the
tips (as given by the element
tip.label of the argument
phy), or, in the case of
dist.nodes, the numbers of the
tips and the nodes (as given by the element