igraph (version 0.5.2-2)

graph-motifs: Graph motifs

Description

Graph motifs are small subgraphs with a well-defined strucure. These functions search a graph for various motifs.

Usage

graph.motifs(graph, size = 3, cut.prob = rep(0, size)) 
graph.motifs.no(graph, size = 3, cut.prob = rep(0, size)) 
graph.motifs.est(graph, size = 3, cut.prob = rep(0, size), sample.size =
    vcount(graph)/10, sample = NULL)

Arguments

graph
Graph object, the input graph.
size
The size of the motif, currently 3 and 4 are supported only.
cut.prob
Numeric vector giving the probabilities that the search graph is cut at a certain level. Its length should be the same as the size of the motif (the size argument). By default no cuts are made.
sample.size
The number of vertices to use as a starting point for finding motifs. Only used if the sample argument is NULL.
sample
If not NULL then it specifies the vertices to use as a starting point for finding motifs.

Value

  • graph.motifs returns a numeric vector.

    graph.motifs.no and graph.motifs.est return a numeric constant.

concept

Graph motif

Details

graph.motifs searches a graph for motifs of a given size and returns a numeric vector containing the number of different motifs. The order of the motifs is defined by their isomorphism class, see graph.isoclass.

graph.motifs.no calculates the total number of motifs of a given size in graph.

graph.motifs.est estimates the total number of motifs of a given size in a graph based on a sample.

See Also

graph.isoclass

Examples

Run this code
g <- barabasi.game(100)
graph.motifs(g, 3)
graph.motifs.no(g, 3)
graph.motifs.est(g, 3)

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