I donot know how to do it remainly. Perhaps my question is not clear. For example,
test=data.frame(sp=paste(c("sp"),1:100,sep=""),x=rnorm(100),y=rnorm(100)) # I want to get the data in the circle of radius = 1 in every point, and I want to add a sign (e.g. sp1,sp2....) in order that I can distinguish different groups # if I want to choose a point, I can do it like this r = 1 # radius attach(test) point100=test[(x-x[100])^2+(y-y[100])^2<=r^2,] result100=data.frame (note=paste(c("p"),rep(100,length(point100$sp)),sep=""),point100) detach(test) But if I want to do all points in "test", I donot know how to do it. I try to do it by using "for", but it doesnot work. Can you give me some advices? thanks! jian zhang [[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