[R] function to find coodinates in an array

Moshe Olshansky m_olshansky at yahoo.com
Fri Aug 17 04:21:05 CEST 2007

A not very good solution is as below:

If your array's dimensions were KxMxN and the "linear"
index is i then
n <- ceiling(i/(K*M))
i1 <- i - (n-1)*(K*M)
m <- ceiling(i1/K)
k <- i1 - (m-1)*K

and your index is (k,m,n)

I am almost sure that there is a function in R which
does this (it exists in Matlab).



--- 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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