[R] use sample function to create new data frame

here is my original data frame a b c A B C [1,] 1 2 3 4 5 6 [2,] 7 8 9 10 11 12 [3,] 13 14 15 16 17 18 a, b, c are type I variables A, B, C are type II variables how can I create a new data frame in which: 1) in each row, there are one random number from type I

Re: [R] use sample function to create new data frame

Gong, thanks!! but your syntax did work out as I would expect. here following are the reasons: each row from my original data frame represents data from one subject. when the one type I number and the two type II numbers are drawn from the original data frame, both type I number and type II

Re: [R] use sample function to create new data frame

Hi, I would try to sample by row index and column index. Hope it helps. df - data.frame(matrix(1:18,nrow=3,ncol=6,byrow=TRUE)) colnames(df) - c(letters[1:3],LETTERS[1:3]) ## Generate a new data frame with 10 rows one - two - three - numeric(10) for (i in 1:10) { ## Sample from type I col.1 -