[R] Find the index for min of a matrix

[Bill.Venables at csiro.au]

> W <- matrix(c(2,4,2,8,1,3), ncol = 3)
> which(W == min(W), arr.ind = TRUE)    #### note difference...
     row col
[1,]   1   3

> W  # chech
     [,1] [,2] [,3]
[1,]    2    2    1
[2,]    4    8    3 


Bill Venables
CSIRO Laboratories
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of kate
Sent: Monday, 31 March 2008 1:53 PM
To: r-help at r-project.org
Subject: [R] Find the index for min of a matrix

Hi,

My example is as the following, 

W<-matrix(c(2,4,2,8,1,3),ncol=3)
which(W==min(W))

I would like to find the index for min of the matrix W, i.e. (1, 3)
instead of 5 as the output. What command could I use?

Thanks,

Kate 
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