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. Let me call the bounds low and high. Restricting the output to the interval [low, high] may be done by rejection method. For example, as follows. x <- low + rexp(n) y <- x[x <= high] If the interval is short, you get much fewer cases in y than n, so n should be adjusted accordingly. Hope this helps. Petr Savicky. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
