I don't know for sure what result you want, but it may be that
using a length(dim(array))-column matrix as your subscript will
do what you want. E.g.,
> a <- array(101:124, dim=4:2)
> subscriptMatrix <- cbind(c(1,3), c(2,2), c(2,1))
> subscriptMatrix
[,1] [,2] [,3]
[1,] 1 2 2
[2,] 3 2 1
> a[subscriptMatrix]
[1] 117 107
> a[1, 2, 2]
[1] 117
> a[3, 2, 1]
[1] 107
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Sat, May 30, 2015 at 3:29 AM, WRAY NICHOLAS <nicholas.w...@ntlworld.com>
wrote:
> Hello folks
>
> Supposing I have a multidimensional array in an R prog, say a 4D array.
>
> I want the coordinate quantities to be read off from a vector. The values
> in the vector (vec) are generated by a function.
>
> This is easy if the number of dimensions is fixed for both the array and
> the number of elements in the vector (say 4):
>
> X<-array[vec[1],vec[2],vec[3],vec[4]]
>
> But if the number of dimensions of the array is not fixed and can change
> during the course of the prog I am stuck as to how to do this, as I don’t
> know a way of feeding a vector or list of unspecified beforehand length
> into the coordinates for an array
>
> I can’t find anything useful about this on the net
>
> Does anyone have any ideas?
> Thanks, Nick
>
> [[alternative HTML version deleted]]
>
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