Re: [R] how to find indices of particular array elements

From: ecoinfo <ecoinformatics_at_gmail.com>
Date: Mon 17 Oct 2005 - 19:39:37 EST

How about the function which?

?which

On 10/17/05, Jonathan Williams
<jonathan.williams@pharmacology.oxford.ac.uk> wrote:
> Dear R helpers,
>
> I have a largish matrix (1300 x 1300) and I wish to find the row and column
> numbers that identify particular elements whose values I know in advance
> (for example, the row and column numbers for the maximum value of the
> matrix).
>
> I have looked in the help manual and found the functions 'row' and 'col' for
> finding the indices of a matrix. But, I can't figure out how to use them to
> obtain the indices of the matrix element with maximum value, despite over an
> hour of trying!
>
> Many thanks for your help,
>
> Jonathan Williams
>
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--
Xiaohua Dai, Dr.
--------------------------------------------------------------------------------
* Postdoctoral in elephant-tree ecosystem simulation
---------------------------------------------------------------------------------
Centre for Systems Research, Durban Institute of Technology
P.O.Box 953, Durban 4000, South Africa
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Received on Mon Oct 17 19:43:34 2005

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