[R] Data contamination

[Wu Gong]

Hi,

You are right, runif(5,1,50) could generate a same value twice. And I think
that your code runs runif(5,1,50) twice too. Try ?sample

selected <- sample(1:50,3)
data.sim[selected,1] <- data.sim[selected,1] + rnorm(5, mean=20, sd=1) 

Hope it helps.

-----
A R learner.
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