On Fri, Jan 27, 2012 at 11:49:13AM +0100, Adel ESSAFI wrote:
> dear list
>
> I use runif to generate a ramdom number between min and max
>
> runif(n, min=0, max=1)
>
>
> however , the syntaxe of rexp does not allow that
>
> rexp(n, rate = 1)
>
>
> and it generate a number with the corresponding rate.
>
> The question is: how to generate a number between min and max using rexp().
Hi.
Alternatively, the inverse distribution function
g <- function(x, lambda) { - 1/lambda * log(1 - x) }
y <- g(runif(n, min=pexp(low, rate=lambda), max=pexp(high, rate=lambda)),
lambda)
may be used. In this case, the length of the output is n.
Hope this helps.
Petr Savicky.
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