Many networks consist of modules which are densely connected themselves but sparsely connected to other modules.
cluster_edge_betweenness(
graph,
weights = NULL,
directed = TRUE,
edge.betweenness = TRUE,
merges = TRUE,
bridges = TRUE,
modularity = TRUE,
membership = TRUE
)The graph to analyze.
The weights of the edges. It must be a positive numeric vector,
NULL or NA. If it is NULL and the input graph has a
‘weight’ edge attribute, then that attribute will be used. If
NULL and no such attribute is present, then the edges will have equal
weights. Set this to NA if the graph was a ‘weight’ edge
attribute, but you don't want to use it for community detection. Edge weights
are used to calculate weighted edge betweenness. This means that edges are
interpreted as distances, not as connection strengths.
Logical constant, whether to calculate directed edge betweenness for directed graphs. It is ignored for undirected graphs.
Logical constant, whether to return the edge betweenness of the edges at the time of their removal.
Logical constant, whether to return the merge matrix
representing the hierarchical community structure of the network. This
argument is called merges, even if the community structure algorithm
itself is divisive and not agglomerative: it builds the tree from top to
bottom. There is one line for each merge (i.e. split) in matrix, the first
line is the first merge (last split). The communities are identified by
integer number starting from one. Community ids smaller than or equal to
\(N\), the number of vertices in the graph, belong to singleton
communities, ie. individual vertices. Before the first merge we have \(N\)
communities numbered from one to \(N\). The first merge, the first line of
the matrix creates community \(N+1\), the second merge creates community
\(N+2\), etc.
Logical constant, whether to return a list the edge removals which actually splitted a component of the graph.
Logical constant, whether to calculate the maximum modularity score, considering all possibly community structures along the edge-betweenness based edge removals.
Logical constant, whether to calculate the membership vector corresponding to the highest possible modularity score.
cluster_edge_betweenness returns a
communities object, please see the communities
manual page for details.
The edge betweenness score of an edge measures the number of shortest paths
through it, see edge_betweenness for details. The idea of the
edge betweenness based community structure detection is that it is likely
that edges connecting separate modules have high edge betweenness as all the
shortest paths from one module to another must traverse through them. So if
we gradually remove the edge with the highest edge betweenness score we will
get a hierarchical map, a rooted tree, called a dendrogram of the graph. The
leafs of the tree are the individual vertices and the root of the tree
represents the whole graph.
cluster_edge_betweenness performs this algorithm by calculating the
edge betweenness of the graph, removing the edge with the highest edge
betweenness score, then recalculating edge betweenness of the edges and
again removing the one with the highest score, etc.
edge.betweeness.community returns various information collected
through the run of the algorithm. See the return value down here.
M Newman and M Girvan: Finding and evaluating community structure in networks, Physical Review E 69, 026113 (2004)
edge_betweenness for the definition and calculation
of the edge betweenness, cluster_walktrap,
cluster_fast_greedy,
cluster_leading_eigen for other community detection
methods.
See communities for extracting the results of the community
detection.
# NOT RUN {
g <- sample_pa(100, m = 2, directed = FALSE)
eb <- cluster_edge_betweenness(g)
g <- make_full_graph(10) %du% make_full_graph(10)
g <- add_edges(g, c(1,11))
eb <- cluster_edge_betweenness(g)
eb
# }
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