Dear Terry, I'm not entirely sure if this is what you're looking for, but here's my suggestion.
To make more uniformly distributed points, you might try something like xy <- expand.grid(list(seq(0,1,.1), seq(0,1,.1))) plot(jitter(xy[,1], 1.5), jitter(xy[,2], 1.5)) Like I said, I don't know if this is any better. For the clumped data, I would suggest a something like draws out of two different normals, something like this: xy1 <- matrix(rnorm(250, .6, .25), ncol=2) xy2 <- matrix(rnorm(250, -.6, .25), ncol=2) xy12 <- rbind(xy1, xy2) plot(xy12) The sd of the normal controls the "clumpiness" of the data. Hope this helps, Dave. -- Dave Armstrong University of Maryland Dept of Government and Politics 3140 Tydings Hall College Park, MD 20742 Office: 2103L Cole Field House Phone: 301-405-9735 e-mail: [EMAIL PROTECTED] web: www.davearmstrong-ps.com On 5/17/06, Beutel, Terry S <[EMAIL PROTECTED]> wrote: > > I am trying to generate two dimensional random coordinates. > > For randomly distributed data I have simply used > > >xy<-cbind(runif(100),runif(100)) > > However I also want to generate coordinates that are more uniformly > distributed, and coordinates that are more contagiously distributed than > the above. > > Can anyone make any suggestions > > Thanks. > > Dr Terry Beutel > Rangeland Scientist > Animal Sciences > Department of Primary Industries and Fisheries > > Telephone 07 4654 4282 Facsimile 07 4654 4235 > Email [EMAIL PROTECTED] > Address DPI Hood Street Charleville Q 4470 > PO Box 282, Charleville Q 4470 > Website www.dpi.qld.gov.au Call Centre 13 25 23 > > > ********************************DISCLAIMER******************...{{dropped}} > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html