How can we allocate dynamic arrays in R or S-plus?

i am generating random #s and then allocating them to run over summation ,and to calculate this summand i need to use 3-d array so my arrays size is dynamic how do i do this in R

Answer:
not sure I understand,

can you simple concat the numbers to your array and reassign

dim(a)
[1] 2 3 4

b <- c(a,1:6)

dim(b)<-c(2,3,5)

b
> b
, , 1

[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6

, , 2

[,1] [,2] [,3]
[1,] 7 9 11
[2,] 8 10 12

, , 3

[,1] [,2] [,3]
[1,] 13 15 17
[2,] 14 16 18

, , 4

[,1] [,2] [,3]
[1,] 19 21 23
[2,] 20 22 24

, , 5

[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6

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How can we allocate dynamic arrays in R or S-plus?

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