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- r<- matrix(c(2,4, NA,5,NA,3, NA,5,NA,1,NA,3,NA,5,NA,4,4,NA,NA,NA,1,1,2,NA,1,1,1,1,NA,NA,NA,NA,2,3,4,2,NA,NA,NA,NA,3,4,5,1,NA,NA,2,3,NA), nrow=7).
- #one row represents one user, hile one column represents one item
- r
- [,1] [,2] [,3] [,4] [,5] [,6] [,7]
- [1,] 2 5 NA 1 NA 2 5
- [2,] 4 NA 4 2 NA NA 1
- [3,] NA 1 4 NA NA NA NA
- [4,] 5 NA NA 1 NA NA NA
- [5,] NA 3 NA 1 2 NA 2
- [6,] 3 NA NA 1 3 3 3
- [7,] NA 5 1 1 4 4 NA
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