on 07/01/2008 04:58 AM Francisco Javier Santos Alamillos wrote:
Hello everyone,
I need reshape an array. For example, if we have next array:
a <- c(1,2,3,4,5,6,7,8,9,10,11,12)
dim(a) <- c(2,2,3)
a
, , 1
[,1] [,2]
[1,] 1 3
[2,] 2 4
, , 2
[,1] [,2]
[1,] 5 7
[2,] 6 8
, , 3
[,1] [,2]
[1,] 9 11
[2,] 10 12
I need to get next matrices:
1 2 3 4
5 6 7 8
9 10 11 12
1 3 2 4
5 7 6 8
9 11 10 12
It exist any function that can be able to do it?
Thanks and sorry for my english.
Keep in mind, as you seem to recognize, that a matrix and an array, is a
vector with a dim attribute.
Thus, to reshape an array or matrix, you need to alter the dim
attribute, perhaps with a transpose for ordering purposes. There is more
than one way to do this, but two would be:
> t(matrix(a, 4, 3))
[,1] [,2] [,3] [,4]
[1,] 1 2 3 4
[2,] 5 6 7 8
[3,] 9 10 11 12
> matrix(a, 3, 4, byrow = TRUE)
[,1] [,2] [,3] [,4]
[1,] 1 2 3 4
[2,] 5 6 7 8
[3,] 9 10 11 12
HTH,
Marc Schwartz
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