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#######################################################################
# #
# Package: BatchMap #
# #
# File: map.func.R #
# Contains: haldane, kosambi, set.map.fun #
# #
# Written by Gabriel Rodrigues Alves Margarido and Marcelo Mollinari #
# copyright (c) 2007-9, Gabriel R A Margarido #
# #
# First version: 11/07/2007 #
# Last update: 11/07/2007 #
# License: GNU General Public License version 2 (June, 1991) or later #
# #
#######################################################################
haldane <-
function(rcmb) {
# rcmb must be a number between 0 and 0.5
if (is.numeric(rcmb)) {
if (rcmb >= 0 && rcmb <= 0.5)
return(100*-(1/2)*log(1-2*rcmb)) # haldane mapping fuction
else stop("the recombination fraction must be between 0 and 0.5")
}
else stop("the argument to 'haldane' function must be ",
dQuote("numeric"))
}
kosambi <-
function(rcmb) {
# rcmb must be a number between 0 and 0.5
if (is.numeric(rcmb)) {
if (rcmb >= 0 && rcmb <= 0.5)
return(100/4*log(abs((1+2*rcmb)/(1-2*rcmb)))) # kosambi mapping fuction
else stop("the recombination fraction must be between 0 and 0.5")
}
else stop("the argument to 'kosambi' function must be ",
dQuote("numeric"))
}
##' Defines the default mapping function
##'
##' Defines the function that should be used to display the genetic map through
##' the analysis.
##'
##'
##' @param type Indicates the function that should be used, which can be
##' \code{"kosambi"} or \code{"haldane"}
##' @author Marcelo Mollinari, \email{mmollina@@usp.br}
##' @seealso \code{\link[BatchMap]{kosambi}} and \code{\link[BatchMap]{haldane}}
##' @references Haldane, J. B. S. (1919) The combination of linkage values and
##' the calculation of distance between the loci of linked factors.
##' \emph{Journal of Genetics} 8: 299-309.
##'
##' Kosambi, D. D. (1944) The estimation of map distance from recombination
##' values. \emph{Annuaire of Eugenetics} 12: 172-175.
##' @keywords arith
set.map.fun<-
function(type=c("kosambi", "haldane")){
type<-match.arg(type,c("kosambi", "haldane"))
if(type=="haldane") assign(".map.fun", "haldane", envir = .onemapEnv)
else assign(".map.fun", "kosambi", envir = .onemapEnv)
}
# end of file
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