Thanks! No, to be consistent with what I get with a matrix I think it should be like:
x <- data.frame(id = DFA$id[1]) x$ar <- DFA$ar[1, , , drop = FALSE] str(x) #'data.frame': 1 obs. of 2 variables: # $ id: int 1 # $ ar: int [1, 1:2, 1:2] 1 3 5 7 Georg Gesendet: Dienstag, 09. Mai 2023 um 09:32 Uhr Von: "Rui Barradas" <ruipbarra...@sapo.pt> An: "Georg Kindermann" <georg.kinderm...@gmx.at>, r-help@r-project.org Betreff: Re: [R] data.frame with a column containing an array Às 11:52 de 08/05/2023, Georg Kindermann escreveu: > Dear list members, > > when I create a data.frame containing an array I had expected, that I get a > similar result, when subsetting it, like having a matrix in a data.frame. But > instead I get only the first element and not all values of the remaining > dimensions. Differences are already when creating the data.frame, where I can > use `I` in case of a matrix but for an array I am only able to insert it in a > second step. > > DFA <- data.frame(id = 1:2) > DFA[["ar"]] <- array(1:8, c(2,2,2)) > > DFA[1,] > # id ar > #1 1 1 > > DFM <- data.frame(id = 1:2, M = I(matrix(1:4, 2))) > > DFM[1,] > # id M.1 M.2 > #1 1 1 3 > > The same when trying to use merge, where only the first value is kept. > > merge(DFA, data.frame(id = 1)) > # id ar > #1 1 1 > > merge(DFM, data.frame(id = 1)) > # id M.1 M.2 > #1 1 1 3 > > Is there a way to use an array in a data.frame like I can use a matrix in a > data.frame? > > I am using R version 4.3.0. > > Kind regards, > Georg > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html[http://www.R-project.org/posting-guide.html] > and provide commented, minimal, self-contained, reproducible code. Hello, Are you looking for something like this? DFA <- data.frame(id = 1:2) DFA[["ar"]] <- array(1:8, c(2,2,2)) DFA$ar[1, , ] #> [,1] [,2] #> [1,] 1 5 #> [2,] 3 7 Hope this helps, Rui Barradas ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.