FindNode | R Documentation |
Scans the entire sub-tree spanned by node
and returns the first Node
having the name
specified. This is mainly useful for trees whose name is unique.
If AreNamesUnique
is FALSE
, i.e. if there is more than one Node
called name
in the tree, then it is undefined which one will be returned.
Also note that this method is not particularly fast. See examples for a faster way to
index large trees, if you need to do multiple searches. See Traverse
if
you need to find multiple Nodes
.
FindNode(node, name)
node |
The root |
name |
The name of the |
The first Node
whose name matches, or NULL
if no such Node
is
found.
AreNamesUnique, Traverse
data(acme)
FindNode(acme, "Outsource")
#re-usable hashed index for multiple searches:
if(!AreNamesUnique(acme)) stop("Hashed index works for unique names only!")
trav <- Traverse(acme, "level")
names(trav) <- Get(trav, "name")
nameIndex <- as.environment(trav)
#you could also use hash from package hash instead!
#nameIndex <- hash(trav)
nameIndex$Outsource
nameIndex$IT
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