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

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