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

[Phil Spector]

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
                                         spec...@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

Thanks in advance,

Eduardo de Oliveira Horta

        [[alternative HTML version deleted]]

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.