Generates a pectinate (caterpillar) tree with the specified tip labels.
Usage
PectinateTree(tips)
Arguments
tips
An integer specifying the number of tips, or a character vector
naming the tips, or any other object from which tip labels can be extracted
with function TipLabels.
Value
PectinateTree and BalancedTree each return a binary tree of
class phylo of the specified shape.