phytools: modified.Grafen – R documentation

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modified.Grafen

Computes modified Grafen edge lengths

Description

This function computes modified Grafen edge lengths in which the length of the edge is determined not by the number of descendant leaves, but instead by the maximum number of node lengths in the path from the node to any leaf.

node.paths is used internally by modified.Grafen and computes the set of paths from a node to all tips descended from that node.

Usage

modified.Grafen(tree, power=2)
node.paths(tree, node)

Arguments

`tree`	object of class `"phylo"`.
`power`	power to raise the depths of each node (in nodes).
`node`	node number for `node.paths`.

Value

An object of class "phylo" with edge lengths.

Author(s)

Liam Revell liam.revell@umb.edu

References

Revell, L. J. (2012) phytools: An R package for phylogenetic comparative biology (and other things). Methods Ecol. Evol., 3, 217-223.