# evolution_games

0th

Percentile

##### Graph games based on evolution

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().

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

Other graph games: component_games, sampling_games, type_games

##### Aliases
• evolution_games
• play_citation_age
• play_forestfire
• play_growing
• play_barabasi_albert
• play_barabasi_albert_aging
##### Examples
# NOT RUN {
plot(play_forestfire(50, 0.5))

# }

Documentation reproduced from package tidygraph, version 1.1.2, License: MIT + file LICENSE

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