line.graph

0th

Percentile

Line graph of a graph

This function calculates the line graph of another graph.

Keywords
graphs
Usage
line.graph(graph)
Arguments
graph
The input graph, it can be directed or undirected.
Details

The line graph L(G) of a G undirected graph is defined as follows. L(G) has one vertex for each edge in G and two vertices in L(G) are connected by an edge if their corresponding edges share an end point.

The line graph L(G) of a G directed graph is slightly different, L(G) has one vertex for each edge in G and two vertices in L(G) are connected by a directed edge if the target of the first vertex's corresponding edge is the same as the source of the second vertex's corresponding edge.

Value

• A new graph object.

Line graph

• line.graph
Examples
# generate the first De-Bruijn graphs
g <- graph.full(2, directed=TRUE, loops=TRUE)
line.graph(g)
line.graph(line.graph(g))
line.graph(line.graph(line.graph(g)))
Documentation reproduced from package igraph, version 0.5.5-3, License: GPL (>= 2)

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