params<-5
pgfpoisson(.2,params)
## The function is currently defined as
pgfpoisson <- 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 (missing(params))
stop("Distribution parameters are not defined")
theta<-params[1]
if (theta<=0)
stop ("Parameter of Poisson distribution must be positive")
exp(theta*(s-1))
}
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