params<-c(4,.5,2)
pgfbinomialpoisson(.5,params)
## The function is currently defined as
pgfbinomialpoisson <- 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)<3) stop("At least one value in params is missing")
if (length(params)>3) stop("The length of params is 3")
theta<-params[1]
p<-params[2]
n<-params[3]
if (theta<=0)
stop ("Parameter theta must be positive")
if ((p>=1)|(p<=0))
stop ("Parameter p belongs to the interval (0,1)")
if (n<0)
stop("Parameter n must be positive")
if(!(abs(n-round(n))<.Machine$double.eps^0.5))
stop("Parameter n must be positive integer")
(1-p+p*exp(theta*(s-1)))^n
}
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