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Dear list useRs, I have to generate a random set of coordinates (x,y) in [-1 ; 1]^2 for say, N points. At each of these points is drawn a circle (later on, an ellipse) of random size, as in: > N <- 100 > > positions <- matrix(rnorm(2 * N, mean = 0 , sd= 0.5), nrow=N) > sizes<-rnorm(N, mean = 0 , sd= 1) > plot(positions,type="p",cex=sizes) My problem is to

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

Is this because the mirrors are busy? I did update to CentOS 4.2 yesterday but now... [root at srv1 file-4.15]# yum install php-devel php-imap Setting up Install Process Setting up repositories dag 100% |=========================| 1.1 kB 00:00 Cannot open/read repomd.xml file for repository: update failure: repodata/repomd.xml from update: [Errno 256] No more mirrors to try.

Sorry for the noob question. I am trying to upgrade an older server from 3.x to 4.x via yum. Yum is resolving the original 3.x repositories and does not appear to be moving to 4.x due to the fact it still wants to use a 2.4.x kernel. Do I need to point yum to another set of repos in order to upgrade versions? Thanks -jeff