[R] Sampling problem

[wangwallace]

Michael, I really appreciate your help.

but I got the following error message when I wan trying to run the function
written by you:

Error in out[i, ] <- apply(help[, c(grp1 + 1, grp2 + 5)], 2, sample, 1) : 
  number of items to replace is not a multiple of replacement length

I am not quite sure why would this happen.

As a novice of R, these functions are kinda complex for me. I am wondering
if it is doable without using loops like that.

Again, thank you so much!!!  
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