[R] function to find coodinates in an array

Gabor Grothendieck ggrothendieck at gmail.com
Fri Aug 17 05:46:28 CEST 2007

Get the indices using expand.grid and then reorder them:

set.seed(1); X <- array(rnorm(24), 2:4) # input
X # look at X

do.call(expand.grid, sapply(dim(X), seq))[order(X),]

On 8/16/07, Ana Conesa <aconesa at ochoa.fib.es> wrote:
> Dear list,
> I am looking for a function/way to get the array coordinates of given
> elements in an array. What I mean is the following:
> - Let X be a 3D array
> - I find the ordering of the elements of X by ord <- order(X) (this
> returns me a vector)
> - I now want to find the x,y,z coordinates of each element of ord
> Can anyone help me?
> Thanks!
> Ana
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