Quickly identifies edges that are 'descended' from a particular edge in a tree
DescendantEdges(edge, parent, child, nEdge = length(parent))AllDescendantEdges(parent, child, nEdge = length(parent))
number of the edge whose child edges are required.
the first column of the edge matrix of a tree of class
phylo, i.e. tree$edge[, 1].
the second column of the edge matrix of a tree of class
phylo, i.e. tree$edge[, 2].
number of edges (calculated from length(parent) if not supplied).
DescendantEdges returns a logical vector stating whether each edge in turn is a descendant of the specified edge
(or the edge itself).
AllDescendantEdges returns a matrix of class logical, with row N
specifying whether each edge is a descendant of edge N (or the edge itself).
AllDescendantEdges: Quickly identifies edges that are 'descended'
from each edge in a tree.
Other tree navigation: AllAncestors,
AncestorEdge, EdgeAncestry,
EdgeDistances, MRCA,
NonDuplicateRoot