addNode
addNode
Add one or more nodes to a graph.
- Keywords
- manip
Usage
addNode(node, object, edges)Arguments
- node
- A character vector of node names.
- object
- A
graph - edges
- A named list of edges.
Details
The supplied nodes are added to the set of nodes of the
object.
If edges are provided then their must be the
same number as there are nodes and the must be in the same
order. The elements of the edges list are vectors. They can be
character vectors of node labels for nodes in object and if so
then they are added with unit weights. If the vector is numeric then
it must be named (with labels corresponding to nodes in the
object) and the values are taken to be the edge weights.
When the object is a distGraph then the edges must
be supplied and they must contain appropriate distances for all nodes
both those in object and those supplied.
Value
-
A new graph of the same class as
object with the supplied node
added to the set of nodes.
See Also
Examples
V <- LETTERS[1:4]
edL1 <- vector("list", length=4)
names(edL1) <- V
for(i in 1:4)
edL1[[i]] <- list(edges=c(2,1,4,3)[i], weights=sqrt(i))
gR <- graphNEL(nodes=V, edgeL=edL1)
gX <- addNode("X", gR)
set.seed(123)
g1 <- randomGraph(letters[1:10], 1:4, p=.3)
g2 <- addNode("z", g1, edges=list(c("a", "h", "g")))
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