Message-ID: <6.2.1.2.0.20051026121805.04d6d348@mail.ozemail.com.au>
Date: 2005-10-26T02:19:41Z
From: Simon Blomberg
Subject: a silly question on index of a matrix
In-Reply-To: <BAY110-F105A75B4511F38DCFDA8D5C7690@phx.gbl>
> ?which
> X <- matrix(2:10, nrow=3)
> which(X == 10, arr.ind=TRUE)
row col
[1,] 3 3
HTH,
simon.
At 11:52 AM 26/10/2005, you wrote:
>Hi netters,
>
>This is probably a silly question,but I can't find the answer after
>searching the R-help archives online. ok, I have a matrix. I know there is
>a "10" somewhere in it. Now I want to
>know the index of the element "10" in this matrix. That is, if X[i,j]=10,
>I want to know
>i and j. Is there a R function to do this? Just like the "find" function
>in matlab.
>
>Thanks all!
>
>
>
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Simon Blomberg, B.Sc.(Hons.), Ph.D, M.App.Stat.
Centre for Resource and Environmental Studies
The Australian National University
Canberra ACT 0200
Australia
T: +61 2 6125 7800 email: Simon.Blomberg_at_anu.edu.au
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