Defines functions simAlleleFreqs

Documented in simAlleleFreqs

#' Simulate Allele Frequencies
#' Simulate some allele frequencies using Dirichlet Random variables
#' @param nLoci \eqn{L} the number of loci in the multiplex
#' @param allelesPerLocus  the number of alleles per locus
#' @param shape the shape parameter
#' @return a list with elements \code{locus.}\eqn{l} where \eqn{l=1,\ldots,L}, each 
#' of which are vectors of length \code{allelesPerLocus[l]}, consisting of allele 
#' frequencies for that locus
#' @export
#' @examples
#' set.seed(123)
#' simAlleleFreqs()
#' @importFrom stats rgamma
simAlleleFreqs = function(nLoci = 10, allelesPerLocus = rep(10, nLoci),
                          shape = rep(3, nLoci)){
  if(length(allelesPerLocus) != nLoci){
    stop(paste0("If the number of alleles at each locus is different,\n",
                "then the number of alleles should be specified for each locus."))
  if(length(shape) != nLoci){
    stop(paste0("If the shape parameters are different for each locus,\n",
                "then a shape parameter should be specified for each locus."))
  freqs = lapply(allelesPerLocus, function(nA){
                 stats::rgamma(nA, shape = shape, rate = 1)
  freqs = lapply(freqs, function(l){l/sum(l)})
  names(freqs) = paste("locus", 1:length(freqs), sep = ".")


Try the DNAtools package in your browser

Any scripts or data that you put into this service are public.

DNAtools documentation built on July 8, 2020, 7:13 p.m.