phangorn (version 2.12.1)

Ancestors: tree utility function

Description

Functions for describing relationships among phylogenetic nodes.

Usage

Ancestors(x, node, type = c("all", "parent"))
allDescendants(x)
Children(x, node)
Descendants(x, node, type = c("tips", "children", "all"))
Siblings(x, node, include.self = FALSE)
mrca.phylo(x, node = NULL, full = FALSE)

Value

a vector or a list containing the indices of the nodes.

Arguments

x

a tree (a phylo object).

node

an integer or character vector (or scalar) corresponding to a node ID

type

specify whether to return just direct children / parents or all

include.self

whether to include self in list of siblings

full

a logical indicating whether to return the MRCAs among all tips and nodes (if TRUE); the default is to return only the MRCAs among tips.

Functions

• allDescendants(): list all the descendant nodes of each node

Details

These functions are inspired by treewalk in phylobase package, but work on the S3 phylo objects. The nodes are the indices as given in edge matrix of an phylo object. From taxon labels these indices can be easily derived matching against the tip.label argument of an phylo object, see example below. All the functions allow node to be either a scalar or vector. mrca is a faster version of the mrca in ape, in phangorn only because of dependencies. If the argument node is missing the function is evaluated for all nodes.

See Also

treewalk, as.phylo, nodelabels

Examples

tree <- rtree(10)
plot(tree, show.tip.label = FALSE)
nodelabels()
tiplabels()
Ancestors(tree, 1:3, "all")
Children(tree, 11)
Descendants(tree, 11, "tips")
Siblings(tree, 3)
# Siblings of all nodes
Siblings(tree)
mrca.phylo(tree, 1:3)
mrca.phylo(tree, match(c("t1", "t2", "t3"), tree$tip))
mrca.phylo(tree)
# same as mrca(tree), but faster for large trees