[R] how to extract the maximum from a matrix?

[Dimitris Rizopoulos]

look at the `arr.ind' argument of ?which(), e.g.,

x <- matrix(rnorm(9), 3, 3)
x
which(x == max(x), arr.ind = TRUE)


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "mirko sanpietrucci" <mirko.sanpietrucci at email.it>
To: <r-help at stat.math.ethz.ch>
Sent: Friday, June 01, 2007 11:09 AM
Subject: [R] how to extract the maximum from a matrix?


> Dear UseRs,
> I have a very simple question. I have a big matrix (say x) including
> probabilities (values in (0,1)).
> I have to store in a list the names of the row and the column where 
> max(x)
> is located. How can I proceed?
>
> Thanks in advance for your assistance!
>
> mirko
>
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> and provide commented, minimal, self-contained, reproducible code.
> 


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