graph-edgeList function

Find edges in a graph and edges not in a graph.

Returns the edges of a graph (or edges not in a graph) where the graph can be either an igraph

object or an adjacency matrix.

edgeList(object, matrix = FALSE)

edgeListMAT(adjmat, matrix = FALSE)

nonEdgeList(object, matrix = FALSE)

nonEdgeListMAT(adjmat, matrix = FALSE)

Arguments

• object: An igraph object, a dense matrix or a sparse dgCMatrix (the two latter representing an adjacency matrix).
• matrix: If TRUE the result is a matrix; otherwise the result is a list.
• adjmat: An adjacency matrix.

Examples

## A graph with edges
g  <- ug(~a:b + b:c + c:d)
gm <- as(g, "matrix")
edgeList(g)
edgeList(gm)
edgeListMAT(gm)
edgeList(g, matrix=TRUE)
edgeList(gm, matrix=TRUE)
edgeListMAT(gm, matrix=TRUE)
nonEdgeList(g)
nonEdgeList(gm)
nonEdgeListMAT(gm)
## A graph without edges
g  <- ug(~a + b + c)
gm <- as(g, "matrix")
edgeList(g)
edgeList(gm)
edgeListMAT(gm)
edgeList(g, matrix=TRUE)
edgeList(gm, matrix=TRUE)
edgeListMAT(gm, matrix=TRUE)
nonEdgeList(g)
nonEdgeList(gm)
nonEdgeListMAT(gm)