# [R] Finding indexes of minum and maximum elements of an array

Phil Spector spector at stat.berkeley.edu
Tue Dec 28 01:17:12 CET 2010

```Here's one way:

> H = array(c(8:5,1:4),dim=c(2,2,2))
> which(H==min(H),arr.ind=TRUE)
dim1 dim2 dim3
[1,]    1    1    2
> which(H==max(H),arr.ind=TRUE)
dim1 dim2 dim3
[1,]    1    1    1
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spector at stat.berkeley.edu

On Mon, 27 Dec 2010, Eduardo de Oliveira Horta wrote:

> Hello there
>
> I wish to get the "coordinates" of the minimum element of an array.
>
> For example, if the array were
>
>> H = array(c(8:5,1:4),dim=c(2,2,2))
>> H
> , , 1
>
>     [,1] [,2]
> [1,]    8    6
> [2,]    7    5
>
> , , 2
>
>     [,1] [,2]
> [1,]    1    3
> [2,]    2    4
>
> then
>> min(H)
> [1] 1
>
> and
>> max(H)
> [1] 8
>
> Say "idx" were the function I'm looking for. Then, what I'm expecting is
>
>> idx(min(H))
> [1] 1 1 2
>> idx(max(H))
> [1] 1 1 1
>
>
> Eduardo de Oliveira Horta
>
> 	[[alternative HTML version deleted]]
>
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