[R] force apply not to drop the dimensions of FUN results ?
Dear R users, Here is my problem: I have an array with at least four dimensions: dim(myArray) [1] 20 17 3 6 I'd like to apply a function to each occurrence of the matrix (3x6) defined by the last two dimensions. This interpolation function always return a matrix of the same dimensions as its argument: interpSecteurs.f(myArray[1, 1, , ]) secteur rotation 1 2 3 4 5 6 1 3 5.25 10 6 6 3 2 3 10.00 10 7 7 3 3 3 0.50 10 8 8 3 But when applying this function with apply, these matrices are coerced in vectors of length 18: test - apply(myArray, + c(1, 2), + interpSecteurs.f) dim(test) [1] 18 20 17 I read in the help that this is the normal behaviour in apply. However, I really need to keep the same dimension as the input data. Do you know any function or method which allows bypassing this behaviour ? (unfortunately my function seems not suitable for a vectorization using sweep) Alternatively, a method to recover the wished array dimensions afterward would be also acceptable. Many thanks in advance. Yves -- --- Yves REECHT Dpt STH (Sciences et Technologies Halieutiques) IFREMER, BP 70 29280 PLOUZANE FRANCE tel. +33 (0)2 98 22 43 69 --)° [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] force apply not to drop the dimensions of FUN results ?
Dear Yves, You may not need to do more than set the dim attribute correctly: dim (test) - c (dim (myArray) [c (3 : 4, 1 : 2)] or dim (test) - c (dim (myArray) [c (4 : 3, 1 : 2)] Claudia -- Claudia Beleites Dipartimento dei Materiali e delle Risorse Naturali Università degli Studi di Trieste Via Alfonso Valerio 6/a I-34127 Trieste phone: +39 0 40 5 58-37 68 email: cbelei...@units.it __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] force apply not to drop the dimensions of FUN results ?
Thank you very much Claudia, That (the first form) works perfectly. Easily made generic using head and tail on the dim attribute. All the best, Yves Claudia Beleites cbelei...@units.it a écrit : Dear Yves, You may not need to do more than set the dim attribute correctly: dim (test) - c (dim (myArray) [c (3 : 4, 1 : 2)] or dim (test) - c (dim (myArray) [c (4 : 3, 1 : 2)] Claudia -- Claudia Beleites Dipartimento dei Materiali e delle Risorse Naturali Università degli Studi di Trieste Via Alfonso Valerio 6/a I-34127 Trieste phone: +39 0 40 5 58-37 68 email: cbelei...@units.it __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
