From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>

Date: Mon 09 Oct 2006 - 10:10:33 GMT

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. Received on Mon Oct 09 20:15:39 2006

Date: Mon 09 Oct 2006 - 10:10:33 GMT

"S.Q. WEN" <randsnews@gmail.com> writes:

*> Hi,
*

> I want to get random number which is uniformly distributed on the unit

*> disc.
**> How can I do that with R?
*

Most easily, although perhaps not most efficiently, by using spherical coordinates:

N <- 10000

r <- sqrt(runif(N))

theta <- runif(N,0,2*pi)

x <- r*cos(theta) y <- r*sin(theta) plot(x,y,pch=".") -- O__ ---- Peter Dalgaard Ă˜ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 ______________________________________________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 and provide commented, minimal, self-contained, reproducible code. Received on Mon Oct 09 20:15:39 2006

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