split() and rep() question

[Martyn Colins <martyncollins10@yahoo.com>]

 

Dear all,

 

I have a matrix similar to this:

 

[,1] [,2] [,3]

[1,] 1 16 31

[2,] 2 17 32

[3,] 3 18 33

[4,] 4 19 34

[5,] 5 20 35

[6,] 6 21 36

[7,] 7 22 37

[8,] 8 23 38

[9,] 9 24 39

[10,] 10 25 40

[11,] 11 26 41

[12,] 12 27 42

[13,] 13 28 43

[14,] 14 29 44

[15,] 15 30 45

 

 

and I would like an efficient method to produce

 

[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14] [,15]

[1,] 1 2 3 4 5 16 17 18 19 20 31 32 33 34 35

[2,] 1 2 3 4 5 16 17 18 19 20 31 32 33 34 35

[3,] 1 2 3 4 5 16 17 18 19 20 31 32 33 34 35

[4,] 1 2 3 4 5 16 17 18 19 20 31 32 33 34 35

[5,] 1 2 3 4 5 16 17 18 19 20 31 32 33 34 35

[6,] 6 7 8 9 10 21 22 23 24 25 36 37 38 39 40

[7,] 6 7 8 9 10 21 22 23 24 25 36 37 38 39 40

[8,] 6 7 8 9 10 21 22 23 24 25 36 37 38 39 40

[9,] 6 7 8 9 10 21 22 23 24 25 36 37 38 39 40

[10,] 6 7 8 9 10 21 22 23 24 25 36 37 38 39 40

[11,] 11 12 13 14 15 26 27 28 29 40 41 42 43 44 45

[12,] 11 12 13 14 15 26 27 28 29 40 41 42 43 44 45

[13,] 11 12 13 14 15 26 27 28 29 40 41 42 43 44 45

[14,] 11 12 13 14 15 26 27 28 29 40 41 42 43 44 45

[15,] 11 12 13 14 15 26 27 28 29 40 41 42 43 44 45

 

Does anyone know how to do this? Been trying various ways to split the matrix using split() and rep() but can't seem to do it.

 

Thanks in advance for your help.

 

Best,

Martyn

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