Why doesn't apply() already do what you want?
-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
"The business of the statistician is to catalyze the scientific learning
process." - George E. P. Box
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Mike Meyer
> Sent: Thursday, October 27, 2005 2:50 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] How to manipulate an abitrary dimensioned array.
>
> If I have an n1 x n1 x 2 array X I can calculate, say,
> X[,,1]/X[,,2].
>
> If it is a 4 dimensional array then I want to be able to calculate
> X[,,,1]/X[,,,2], and similarly for higher dimensions.
>
> How can I write a function to do this in a general way
> without having to
> do a switch for each possible length(dim(X)). So I want a function g
> that will take an arbitrary dimensioned array, X, and return
> X[,,,1]/X[,,,2], etc. I know how to do this by turning X into a
> vector, then doing the division, then re-shaping as an array,
> but that
> doesn't seem very elegant.
>
> What I think I am missing is how to paste/substitute/eval a bunch of
> commas into an array selection.
>
> Thanks, --Mike
>
> --
> Mike Meyer, Seattle WA
>
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