On Sep 27, 2009, at 6:33 PM, Daniel Malter wrote:
Hi, I have an array of dimension 6:6:160000. I want to stack the
160000
slices of the array into a matrix or a data frame of dimension
6:(6*160000=960000) in order to write it to a csv file. It seems I
cannot
get the matrix or data.frame functions to put the values from the
array in
the same order as they appear in the array easily, but I am almost
sure
there is an easy way to do this.
#Here is code for a small 6:6:2 array.
x=rep(rep(1:6,each=6),2)
dim(x)=c(6,6,2)
x
#Matrix approach 1:
matrix(x,nrow=12,ncol=6,byrow=F)
#Matrix approach 2:
matrix(x,nrow=12,ncol=6,byrow=T)
#Data frame approach (cbinds rather than rbinds):
data.frame(x)
None of the above works as I would like to. The "correct" approach
should
stack the same values all in the same column of the matrix or data
frame. I
also could not get "stack" to work correctly and would appreciate
your help.
apply(x, 2 , I)
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 1 2 3 4 5 6
[2,] 1 2 3 4 5 6
[3,] 1 2 3 4 5 6
[4,] 1 2 3 4 5 6
[5,] 1 2 3 4 5 6
[6,] 1 2 3 4 5 6
[7,] 1 2 3 4 5 6
[8,] 1 2 3 4 5 6
[9,] 1 2 3 4 5 6
[10,] 1 2 3 4 5 6
[11,] 1 2 3 4 5 6
[12,] 1 2 3 4 5 6
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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