drbs <- function(x, N, S, log = FALSE) {
N[ !is.finite(N) | N <= 0 | !is.wholenumber(N) ] <- NaN
S[ !is.finite(S) | S <= 0 | !is.wholenumber(S) ] <- NaN
y <- sapply(x, function(z)N/S*sum((z:S)^-1))/N
if (any(is.nan(y))) warning ("NaNs produced")
if (any(!is.wholenumber(x))) warning("non integer values in x")
y[ ! is.wholenumber(x) | x < 1 | x > S ] <- 0
if(!log) return(y)
else return(log(y))
}
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