sample_gnp: Generate random graphs according to the G(n,p) Erdős-Rényi...

In igraph: Network Analysis and Visualization

Generate random graphs according to the G(n,p) Erdős-Rényi model

Description

Every possible edge is created independently with the same probability p. This model is also referred to as a Bernoulli random graph since the connectivity status of vertex pairs follows a Bernoulli distribution.

Usage

sample_gnp(n, p, directed = FALSE, loops = FALSE)

gnp(...)

Arguments

n	The number of vertices in the graph.
p	The probability for drawing an edge between two arbitrary vertices (G(n,p) graph).
directed	Logical, whether the graph will be directed, defaults to FALSE.
loops	Logical, whether to add loop edges, defaults to FALSE.
...	Passed to sample_gnp().

Details

The graph has n vertices and each pair of vertices is connected with the same probability p. The loops parameter controls whether self-connections are also considered. This model effectively constrains the average number of edges, p m_\text{max}, where m_\text{max} is the largest possible number of edges, which depends on whether the graph is directed or undirected and whether self-loops are allowed.

Value

A graph object.

Author(s)

Gabor Csardi [e-mail]

References

Erdős, P. and Rényi, A., On random graphs, Publicationes Mathematicae 6, 290–297 (1959).

See Also

Random graph models (games) erdos.renyi.game(), sample_(), sample_bipartite(), sample_chung_lu(), sample_correlated_gnp(), sample_correlated_gnp_pair(), sample_degseq(), sample_dot_product(), sample_fitness(), sample_fitness_pl(), sample_forestfire(), sample_gnm(), sample_grg(), sample_growing(), sample_hierarchical_sbm(), sample_islands(), sample_k_regular(), sample_last_cit(), sample_pa(), sample_pa_age(), sample_pref(), sample_sbm(), sample_smallworld(), sample_traits_callaway(), sample_tree()

Examples

# Random graph with expected mean degree of 2
g <- sample_gnp(1000, 2 / 1000)
mean(degree(g))
degree_distribution(g)

# Pick a simple graph on 6 vertices uniformly at random
plot(sample_gnp(6, 0.5))

igraph documentation built on Oct. 20, 2024, 1:06 a.m.