From: Michael Kubovy > > On Mar 21, 2007, at 4:16 AM, Uwe Ligges wrote: > > > Michael Kubovy wrote: > >> Dear r-helpers, > >> Could you please help me solve the following problem: When I run > >> require(AlgDesign) > >> trt <- LETTERS[1:5] > >> blk <- 10 > >> trtblk <- 3 > >> BIB <- optBlock(~., withinData = trt, blocksizes = > rep(trtblk, blk)) > >> In response to the last command, R complains: > >> Error in optBlock(~., withinData = trt, blocksizes = rep(trtblk, > >> blk)) : > >> object ".Random.seed" not found > >> The documentation of optBlock() in AlgDesign doesn't say that I > >> needed to set .Random.seed. I thought it was initiated > automatically > >> at the beginning of a session. What am I missing? > > > > > > The first line in that function is > > seed <- .Random.seed > > but .Random.seed is generated at the first use of R's RNG, hence > > maybe later. This means the function contains a bug which you > > should report to the package maintainer, please. > > > > Best, > > Uwe Ligges > > Bob Wheeler's response: > > > From: Bob Wheeler <[EMAIL PROTECTED]> > > Date: March 21, 2007 9:19:29 AM EDT > > To: Michael Kubovy <[EMAIL PROTECTED]> > > Subject: Re: > > > > Each workspace in R requires you to set a random seed to > start. You > > have not done this. It is an R artifact, and has nothing to > do with > > AlgDesign.
I do not agree with that assessment (well, it's just my $0.02 anyway). I don't need a random seed unless I'm doing computations that requires pseudo-random numbers. There are plenty of times I use R without needing random seed. None of the builtin RNGs in R requires explcit seed setting, nor does any of the ones in the contributed packages that I know of. Thus I would claim that's a flaw in AlgDesign. Andy > > -- > > Bob Wheeler --- http://www.bobwheeler.com/ > > ECHIP, Inc. --- Randomness comes in bunches. > > ______________________________________________ > [email protected] 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. > > > ------------------------------------------------------------------------------ Notice: This e-mail message, together with any attachments,...{{dropped}} ______________________________________________ [email protected] 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.
