qrbs<-function(p, N, S, lower.tail = TRUE, log.p = FALSE){
if (length(N) > 1 | length(S) > 1) stop("vectorization of parameters is not implemented")
if (N <= 0 | S <= 0 | !is.wholenumber(N) | !is.wholenumber(S)) return(rep(NaN, length(p)))
if (log.p) p <- exp(p)
if(!lower.tail) p <- 1-p
## Ugly: just to make qrbs(1, ...) = S
p[p==1] <- 1+1e-12
Y <- 1:S
X <- prbs(Y, N=N, S=S)
approx(x=X, y=Y, xout=p, method="constant", rule=2)$y
}
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