Dear R users,
I'd like to make 4 by 7 matrices as many as possible with natural numbers 1
through 28 such that each matrix have different elements of each column.
For example,
simply here is one
> a1 <- matrix(1:28, 4,7)
> a1
[,1] [,2] [,3] [,4] [,5] [,6] [,7]
[1,] 1 5 9 13 17 21 25
[2,] 2 6 10 14 18 22 26
[3,] 3 7 11 15 19 23 27
[4,] 4 8 12 16 20 24 28
another one
> a2 <- matrix(1:28, 4,7, byrow=T)
> a2
[,1] [,2] [,3] [,4] [,5] [,6] [,7]
[1,] 1 2 3 4 5 6 7
[2,] 8 9 10 11 12 13 14
[3,] 15 16 17 18 19 20 21
[4,] 22 23 24 25 26 27 28
Matrices a1 and a2 have different columns, and I guess there are such many
matrices.
Any suggestion will be greatly appreciated.
Best,
Kathryn Lord
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