How to manipulate an abitrary dimensioned array.
Thanks for the suggestion. Perhaps I can see how to use apply to get the ratio, but say I also want to return X[,,,,1] in a general way. Maybe I am being dense but I just don't see it --- probably as a result of too much Perl/Python/Java recently that is clouding my mind. So can someone suggest a general function that will give me the last layer of an arbitrary dimensioned array?
Berton Gunter wrote:
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
______________________________________________ R-help at stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
______________________________________________ R-help at stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Mike Meyer, Seattle WA