[R] how to randomize data matrix

[Spencer Graves]

 >A <- array(1:16, dim=c(4,4))
dimnames(A) <- list(LETTERS[1:4], letters[1:4])
A[sample(1:4), ]
 > A <- array(1:16, dim=c(4,4))
 > dimnames(A) <- list(LETTERS[1:4], letters[1:4])
 > A[sample(1:4), ]
   a b  c  d
C 3 7 11 15
B 2 6 10 14
D 4 8 12 16
A 1 5  9 13
 >
hope this helps.  spencer graves

szhan at uoguelph.ca wrote:
> Dear R users:
> Is there a function or easier way to randomize the data between rows
> (considering a row as a whole unit)? For example,
> original data:
>    A1  A2  A3  A4
> B1 1   2   3   4
> B2 5   6   7   8
> B3 9   10  11  12
> B4 13  14  15  16
> randomized data:
>    A1  A2  A3  A4
> B4 13  14  15  16
> B2 5   6   7   8
> B1 1   2   3   4
> B3 9   10  11  12
> Thank you for your attention!
> Joshua
> 
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