R/pgfDpoisson.R

In Compounding: Computing Continuous Distributions

pgfDpoisson <-
function(s,params) {
   k<-s[abs(s)>1]
if (length(k)>0)
    warning("At least one element of the vector s are out of interval [-1,1]")
if (length(params)>1) stop("The length of params is 1")
    theta<-params[1]
if (theta<=0) 
    stop ("Parameter of Poisson distribution must be positive")
    theta*exp(theta*(s-1))
}