rgompertz, Gompertz random number

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#inverse of gompertz CDF
# see http://hongqinlab.blogspot.com/2013/06/median-lifespan-of-2-parameter-gompertz.html
#inverse.gomp.CDF = function(R,G,y) {  (1/G)*log(1 - (G/R)*log(1-y)  ) }

#see generate random number with a given distribution
# http://hongqinlab.blogspot.com/2013/12/generate-gompertz-random-numbers.html

#generate Gompertz random numbers
rgompertz = function(R,G, n){
  x.uniform = runif(n)
  inverse.gomp.CDF = function(R,G,y) {  (1/G)*log(1 - (G/R)*log(1-y)  ) }
  x.gompertz = inverse.gomp.CDF(0.001,0.2, x.uniform)
  return(x.gompertz)
}
rgompertz(0.001,0.2,100)