Date: Fri, 26 Jul 1996 13:39:49 +1200 From: Ross Ihaka <ihaka@stat.auckland.ac.nz> Message-Id: <199607260139.NAA09795@stat.auckland.ac.nz> To: R-testers@stat.math.ethz.ch Subject: R-alpha: random seed In-Reply-To: <96Jul25.144639edt.29472@mailgate.bank-banque-canada.ca> There is an invisible variable called .Random.seed which contains the current seeds. You can do things like print(.Random.seed) old.seeds <- .Random.seed rnorm(1000) .Random.seed <- old.seed norm(1000) # same sequence If there is no variable called .Random.seed one is created by fiddling with the system clock and the generator in the standard C library. We did this to try to ensure that students all got different sequences to make it eassy to stomp on cheats. The underlying generator is the Wichman-Hill one from Applied Statistics. It uses 3 integer seeds, so that .Random.seed should be a numeric vector containing 3 integer values. Ross =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- r-testers mailing list -- To (un)subscribe, send subscribe or unsubscribe (in the "body", not the subject !) To: r-testers-request@stat.math.ethz.ch =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-