Get the starting branch' nodes for each part on a tree

PCMTreeGetPartition(tree)

## Arguments

tree a phylo object with an edge.part member denoting parts. The function assumes that each part covers a linked set of branches on the tree.

## Value

a named integer vector with elements equal to the starting nodes for each part in tree and names equal to the labels of these nodes.

## Details

We call a starting branch the first branch from the root to the tips of a given part. A starting node is the node at which a starting branch ends.

PCMTreeSetPartition
set.seed(1, kind = "Mersenne-Twister", normal.kind = "Inversion")
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