graph.nodes | R Documentation |
Return root, end, or branchpoints of an igraph object
graph.nodes(
x,
type = c("root", "end", "branch"),
original.ids = "name",
exclude.isolated = TRUE
)
x |
An |
type |
one of root, end (which includes root) or branch |
original.ids |
Use named attribute to return original vertex ids (when available). Set to FALSE when this is not desired. |
exclude.isolated |
Do not count isolated vertices as root/end points (default) |
This function underlies rootpoints.igraph
methods and
friends. It is conceived of as slightly lower level and end users would
normally use the rootpoints
methods.
graph.nodes
should work for any igraph
object
(including ngraph
objects, which inherit from igraph
).
However the graph must be directed in order to return a root point
rootpoints
, ngraph
ng=as.ngraph(Cell07PNs[[1]])
# set some arbitrary vertex identifiers
igraph::vertex_attr(ng, 'name') <-sample(500, nvertices(ng))
# return those identifiers
graph.nodes(ng, type = 'end')
# ... or raw vertex indices
graph.nodes(ng,type = 'end', original.ids = FALSE)
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