evolution_games: Graph games based on evolution

In tidygraph: A Tidy API for Graph Manipulation

Graph games based on evolution

Description

This games create graphs through different types of evolutionary mechanisms (not necessarily in a biological sense). The nature of their algorithm is described in detail at the linked igraph documentation.

Usage

play_citation_age(
  n,
  growth = 1,
  bins = n/7100,
  p_pref = (1:(bins + 1))^-3,
  directed = TRUE
)

play_forestfire(
  n,
  p_forward,
  p_backward = p_forward,
  growth = 1,
  directed = TRUE
)

play_growing(n, growth = 1, directed = TRUE, citation = FALSE)

play_barabasi_albert(
  n,
  power,
  growth = 1,
  growth_dist = NULL,
  use_out = FALSE,
  appeal_zero = 1,
  directed = TRUE,
  method = "psumtree"
)

play_barabasi_albert_aging(
  n,
  power,
  power_age,
  growth = 1,
  growth_dist = NULL,
  bins = 300,
  use_out = FALSE,
  appeal_zero = 1,
  appeal_zero_age = 0,
  directed = TRUE,
  coefficient = 1,
  coefficient_age = 1,
  window = NULL
)

Arguments

n	The number of nodes in the graph.
growth	The number of edges added at each iteration
bins	The number of aging bins
p_pref	The probability that an edge will be made to an age bin.
directed	Should the resulting graph be directed
p_forward, p_backward	Forward and backward burning probability
citation	Should a citation graph be created
power	The power of the preferential attachment
growth_dist	The distribution of the number of added edges at each iteration
use_out	Should outbound edges be used for calculating citation probability
appeal_zero	The appeal value for unconnected nodes
method	The algorithm to use for graph creation. Either 'psumtree', 'psumtree-multiple', or 'bag'
power_age	The aging exponent
appeal_zero_age	The appeal value of nodes without age
coefficient	The coefficient of the degree dependent part of attrictiveness
coefficient_age	The coefficient of the age dependent part of attrictiveness
window	The aging window to take into account when calculating the preferential attraction

Value

A tbl_graph object

Functions

• play_citation_age(): Create citation graphs based on a specific age link probability. See igraph::sample_last_cit()

• play_forestfire(): Create graphs by simulating the spead of fire in a forest. See igraph::sample_forestfire()

• play_growing(): Create graphs by adding a fixed number of edges at each iteration. See igraph::sample_growing()

• play_barabasi_albert(): Create graphs based on the Barabasi-Alberts preferential attachment model. See igraph::sample_pa()

• play_barabasi_albert_aging(): Create graphs based on the Barabasi-Alberts preferential attachment model, incoorporating node age preferrence. See igraph::sample_pa_age().

See Also

play_traits() and play_citation_type() for an evolutionary algorithm based on different node types

Other graph games: component_games, sampling_games, type_games

Examples

plot(play_forestfire(50, 0.5))

tidygraph documentation built on June 22, 2024, 11:32 a.m.