| Neighbours of nodes in an undirected graph {MXM} | R Documentation |
Returns the node(s) and their neighbour(s), if there are any.
Description
Returns the node(s) and their neighbour(s) of one or more nodes (if there are any).
Usage
nei(G, node)
Arguments
G |
The adjacency matrix of an undirected graph as produced by |
node |
A vector with one or more numbers indicating the seleted node(s) (or variable(s)). |
Details
This is a way to see the network for some given nodes. It is useful if you have many nodes and the whole network is a bit difficult to see clearly.
Value
A list object called "geit" containing the neighbours of the node(s). If there are no neighbours a message appears and no plot is presented. If the "graph" argument is set to TRUE and there are neighbours, a plot will appear.
Bear in mind that the values can be extracted with the $ symbol, i.e. this is an S3 class output.
Author(s)
Michail Tsagris
R implementation and documentation: Michail Tsagris mtsagris@uoc.gr
See Also
Examples
# simulate a dataset with continuous data
set.seed(1234)
dataset <- matrix(runif(500 * 20, 1, 100), nrow = 500 )
G <- pc.con(dataset)$G
plotnetwork(G)
dev.new()
nei( G, c(3, 4) )
nei( G, c(1, 3) )