gRbase (version 2.0.3)

graph-edgeList: Find edges in a graph and edges not in a graph.

Description

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.

Usage

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)