Get the starting branch' nodes for each part on a tree
PCMTreeGetPartition(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.
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.
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
# NOT RUN { set.seed(1, kind = "Mersenne-Twister", normal.kind = "Inversion") PCMTreeGetPartition(PCMTree(ape::rtree(20))) # }
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