# R igraph manual pages

Use this if you are using igraph from R

## Graph motifs

### Description

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

### Usage

sample_motifs(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.

### Details

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

### Value

A numeric scalar, an estimate for the total number of motifs in the graph.

isomorphism_class

Other graph motifs: count_motifs, motifs

### Examples

g <- barabasi.game(100)
motifs(g, 3)
count_motifs(g, 3)
sample_motifs(g, 3)


[Package igraph version 1.2.3 Index]