I think it's easier than you are making it: the random seed is created in a "pretty-random" way when you first use it and then it is updated with each call to rDIST().
For example, set.seed(1) x1 <- .Random.seed rnorm(1) x2 <- .Random.seed rnorm(1) x3 <- .Random.seed identical(x1, x2) FALSE identical(x1, x3) FALSE identical(x2, x3) FALSE set.seed(1) identical(x1, .Random.seed) TRUE rnorm(2) identical(x3, .Random.seed) TRUE But the period for the random seed to repeat is very, very long so you don't have to think about it unless you really need to (or for reproducible simulations) Michael On Sat, Nov 5, 2011 at 7:22 PM, Md Desa, Zairul Nor Deana Binti <znde...@ku.edu> wrote: > Thank you everybody for the helpful advices. > Basically, I try to figure out why I get different numbers as there are more > than one seed for a loop within a loop. Well, I guest I got it now. Because > every time random seed is called or specified it'll output different random > numbers, as it's requested. > > Thanks! > > D > ________________________________________ > From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] on behalf > of Rolf Turner [rolf.tur...@xtra.co.nz] > Sent: Saturday, November 05, 2011 3:22 PM > To: Patrick Burns > Cc: r-help@r-project.org; achim.zeil...@uibk.ac.at > Subject: Re: [R] set seed for random draws > > On 05/11/11 22:00, Patrick Burns wrote: > > <SNIP> >> I'd suggest two rules of thumb when coming >> up against something in R that you aren't >> sure about: >> >> 1. If it is a mundane task, R probably >> takes care of it. >> >> 2. Experiment to see what happens. >> >> >> Of course you could read documentation, but >> no one does that. > > <SNIP> > > Fortune nomination! > > cheers, > > Rolf > > ______________________________________________ > 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. > > > ______________________________________________ > 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. > ______________________________________________ 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.
