Runs Wright-Fisher simulations

This function simulates populations made up of diploid organisms that reproduce in non-overlapping generations. Each individual has a pair of homologous chromosomes that contains interspersed selected and neutral loci. For the initial generation, the genotype for each individual’s chromosomes is randomly drawn from distributions at linkage equilibrium and in Hardy-Weinberg equilibrium.

See documentation and tutorial for a complete description of the simulations. These documents can be accessed at http://georges.biomatix.org/dartR

Take into account that the simulations will take a little bit longer the first time you use the function gl.sim.WF.run() because C++ functions must be compiled.

Usage

gl.sim.WF.run(
  file_var,
  ref_table,
  x = NULL,
  file_dispersal = NULL,
  number_iterations = 1,
  every_gen = 10,
  sample_percent = 50,
  store_phase1 = FALSE,
  interactive_vars = TRUE,
  seed = NULL,
  verbose = NULL,
  ...
)

Arguments

file_var: Path of the variables file 'sim_variables.csv' (see details) [required if interactive_vars = FALSE].
ref_table: Reference table created by the function gl.sim.WF.table [required].
x: Name of the genlight object containing the SNP data to extract values for some simulation variables (see details) [default NULL].
file_dispersal: Path of the file with the dispersal table created with the function gl.sim.create_dispersal [default NULL].
number_iterations: Number of iterations of the simulations [default 1].
every_gen: Generation interval at which simulations should be stored in a genlight object [default 10].
sample_percent: Percentage of individuals, from the total population, to sample and save in the genlight object every generation [default 50].
store_phase1: Whether to store simulations of phase 1 in genlight objects [default FALSE].
interactive_vars: Run a shiny app to input interactively the values of simulations variables [default TRUE].
seed: Set the seed for the simulations [default NULL].
verbose: Verbosity: 0, silent or fatal errors; 1, begin and end; 2, progress log; 3, progress and results summary; 5, full report [default 2, unless specified using gl.set.verbosity].
...: Any variable and its value can be added separately within the function, will be changed over the input value supplied by the csv file. See tutorial.

Value

Returns genlight objects with simulated data.

Details

Values for simulation variables can be submitted into the function interactively through a shiny app if interactive_vars = TRUE. Optionally, if interactive_vars = FALSE, values for variables can be submitted by using the csv file 'sim_variables.csv' which can be found by typing in the R console: system.file('extdata', 'sim_variables.csv', package ='dartR').

The values of the variables can be modified using the third column (“value”) of this file.

The output of the simulations can be analysed seemingly with other dartR functions.

If a genlight object is used as input for some of the simulation variables, this function access the information stored in the slots x$position and x$chromosome.

To show further information of the variables in interactive mode, it might be necessary to call first: 'library(shinyBS)' for the information to be displayed.

The main characteristics of the simulations are:

Simulations can be parameterised with real-life genetic characteristics such as the number, location, allele frequency and the distribution of fitness effects (selection coefficients and dominance) of loci under selection.
Simulations can recreate specific life histories and demographics, such as source populations, dispersal rate, number of generations, founder individuals, effective population size and census population size.
Each allele in each individual is an agent (i.e., each allele is explicitly simulated).
Each locus can be customisable regarding its allele frequencies, selection coefficients, and dominance.
The number of loci, individuals, and populations to be simulated is only limited by computing resources.
Recombination is accurately modeled, and it is possible to use real recombination maps as input.
The ratio between effective population size and census population size can be easily controlled.
The output of the simulations are genlight objects for each generation or a subset of generations.
Genlight objects can be used as input for some simulation variables.

Author

Custodian: Luis Mijangos – Post to https://groups.google.com/d/forum/dartr

Examples

if (FALSE) { # \dontrun{
ref_table <- gl.sim.WF.table(file_var=system.file('extdata', 
'ref_variables.csv', package = 'dartR'),interactive_vars = FALSE)
res_sim <- gl.sim.WF.run(file_var = system.file('extdata', 
'sim_variables.csv', package ='dartR'),ref_table=ref_table,
interactive_vars = FALSE)
} # }