# R igraph manual pages

Use this if you are using igraph from R

## Infomap community finding

### Description

Find community structure that minimizes the expected description length of a random walker trajectory

### Usage

cluster_infomap(
graph,
e.weights = NULL,
v.weights = NULL,
nb.trials = 10,
modularity = TRUE
)


### Arguments

 graph The input graph. e.weights If not NULL, then a numeric vector of edge weights. The length must match the number of edges in the graph. By default the ‘weight’ edge attribute is used as weights. If it is not present, then all edges are considered to have the same weight. Larger edge weights correspond to stronger connections. v.weights If not NULL, then a numeric vector of vertex weights. The length must match the number of vertices in the graph. By default the ‘weight’ vertex attribute is used as weights. If it is not present, then all vertices are considered to have the same weight. A larger vertex weight means a larger probability that the random surfer jumps to that vertex. nb.trials The number of attempts to partition the network (can be any integer value equal or larger than 1). modularity Logical scalar, whether to calculate the modularity score of the detected community structure.

### Details

Please see the details of this method in the references given below.

### Value

cluster_infomap returns a communities object, please see the communities manual page for details.

### Author(s)

Martin Rosvall wrote the original C++ code. This was ported to be more igraph-like by Emmanuel Navarro. The R interface and some cosmetics was done by Gabor Csardi csardi.gabor@gmail.com.

### References

The original paper: M. Rosvall and C. T. Bergstrom, Maps of information flow reveal community structure in complex networks, PNAS 105, 1118 (2008) http://dx.doi.org/10.1073/pnas.0706851105, https://arxiv.org/abs/0707.0609

A more detailed paper: M. Rosvall, D. Axelsson, and C. T. Bergstrom, The map equation, Eur. Phys. J. Special Topics 178, 13 (2009). http://dx.doi.org/10.1140/epjst/e2010-01179-1, https://arxiv.org/abs/0906.1405.

Other community finding methods and communities.

### Examples


## Zachary's karate club
g <- make_graph("Zachary")

imc <- cluster_infomap(g)
membership(imc)
communities(imc)



[Package igraph version 1.2.6 Index]