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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