Subtree() safely extracts a clade from a phylogenetic tree.
Usage
Subtree(tree, node)
Arguments
tree
A tree of class phylo, with internal numbering
in cladewise order (use Preorder(tree) or (slower)
Cladewise(tree)) .
node
The number of the node at the base of the clade to be extracted.
Value
Subtree() returns a tree of class phylo that represents a
clade extracted from the original tree.
Details
Modified from the ape function extract.clade, which
sometimes behaves erratically.
Unlike extract.clade, this function supports the extraction of 'clades'
that constitute a single tip.