[R] replicate rows

[Eric Berger]

Hi Catalin,

This should work. I set the number of repetitions and sample sizes as
variables so it would be clear how to modify for your actual case.

nreps    <- 3
sampSize <- 2
w <- unlist( lapply(1:nreps, function(i) {
rep(paste("R",i,sep=""),sampSize) } ) )
aa2 <- cbind( as.data.frame(aa), w)

HTH,
Eric


On Sun, Jul 8, 2018 at 11:44 AM, catalin roibu <catalinroibu using gmail.com>
wrote:

> Dear R users,
>
> I want to replicate sampled rows in data frame. The sampling results must
> be in this form:
>
>   a   b     Rep
> [1,] 3 4.0 R1
> [2,] 6 8.0 R1
> [3,] 1 0.1 R2
> [4,] 6 8.0 R2
> [5,] 1 0.1 R3
> [6,] 5 7.0 R3
>
> I have a code but I didn't succeed to insert to rep column.
>
> This is my code:
> a<-c(1,2,3,4,5,6)
> b<-c(0.1, 0.2, 4, 6, 7, 8)
> ab<-cbind(a, b)
> x<-replicate(3, sample(1:nrow(ab), 2))
> aa<-ab[x, ]
>
> Please help me to solve that problem!
>
> Thank you very much!
>
> Best regards!
>
> Catalin
>
> --
>
> -
> -
> Catalin-Constantin ROIBU
> ​
> Lecturer PhD, Forestry engineer
> Forestry Faculty of Suceava
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