newgraph: Create a graph object of class graph

In RnavGraph: Using Graphs as a Navigational Infrastructure

Description

Create a graph object of class graphNEL or graphAM. You might also use the graph creating facility provided by the graph package.

Usage

newgraph(nodeNames, mat, weights = NULL, directed = FALSE, isAdjacency = FALSE, ...)

Arguments

nodeNames	Numeric or character string vector.
mat	Either an adjacency matrix or a from to matrix.
weights	Numeric weights for edges. Either in the same order as the from to matrix or as a square matrix, depending what one have chosen for the mat argument.
directed	Logical value for defining a directed or undirected graph.
isAdjacency	If argument mat is adjacency matrix.
...	Currently not needed.

Value

graphNEL or grapAM object.

Author(s)

Adrian Waddell and R. Wayne Oldford

See Also

navGraph, completegraph, linegraph

Examples

## Using from to matrices
from <- c("A","A","C","C")
to   <- c("B","C","B","D")
ftEmat <- cbind(from,to)

## note how the E node is added
G <- newgraph(nodeNames = LETTERS[1:5], mat = ftEmat)

## say you would like to add weights to the graph
weights <- c(2,1,3,4)
G <- newgraph(nodeNames = LETTERS[1:5], mat = ftEmat, weights = weights)

## newgraph with adjacency matrix
V <- c('s.L', 's.W', 'p.L', 'p.W')
adjM <- matrix(c(0,1,1,0,1,0,1,1,1,1,0,0,0,1,0,0), ncol = 4)
all(adjM == t(adjM)) ## is symmetric (undirected)
G <- newgraph(nodeNames = V, mat= adjM, isAdjacency=TRUE)

## if you use adjacency matrices, you can add a matrix with weights
adjM <-     matrix(c(0,0,1,0,1,0,1,1,0,0,0,0,0,1,0,0), ncol = 4)
weightsM <- matrix(c(0,0,5,0,2,0,1,3,0,0,0,0,0,7,0,0), ncol = 4)
G <- newgraph(nodeNames = V, mat= adjM, weights = weightsM, directed = TRUE, isAdjacency=TRUE)
edgeData(G, attr = "weight")

RnavGraph documentation built on May 29, 2017, 4:18 p.m.