[BioC] how split a matrix

[Yuan Hao]

There's a function 'split()' in R
Just set the columns you would like to cluster into as a factor.

 > ?split()
Usage:

      split(x, f, drop = FALSE, ...)
      split(x, f, drop = FALSE, ...) <- value
      unsplit(value, f, drop = FALSE)

Cheers,
Yuan

On 24 Feb 2012, at 13:27, Ali Mohammadian wrote:

> Hi Sirs,
>
> I have a matrix, and I have written  a function to split it by its
> columns, the algorithm works manually, but does not work in R:
>
> A= matrix (rnorm (96),8,12)
> get.replicates = function (A, reps=reps){
> 	temp = array(-999,dim=c(dim (A) [2]/reps,dim(A) [1],reps))
> 	for (replicates.no in 1: (dim (A) [2]/reps)) {
> 	temp [replicates.no, , ] = A [ , reps*(replicates.no-1)+1:
> reps*(replicates.no) ]
> 	}
> temp	
> }
>
> get.replicates (A,3)
>
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