Hi Dave, I tested the "as.array". It gives a different dimension when compared to "array"
set.seed(1) datE<-data.frame(A=rnorm(30,0.5)) myArr=as.array(unlist(datE),dim=c(5,2,3)) > myArr A1 A2 A3 A4 A5 A6 -0.12645381 0.68364332 -0.33562861 2.09528080 0.82950777 -0.32046838 A7 A8 A9 A10 A11 A12 0.98742905 1.23832471 1.07578135 0.19461161 2.01178117 0.88984324 A13 A14 A15 A16 A17 A18 -0.12124058 -1.71469989 1.62493092 0.45506639 0.48380974 1.44383621 A19 A20 A21 A22 A23 A24 1.32122120 1.09390132 1.41897737 1.28213630 0.57456498 -1.48935170 A25 A26 A27 A28 A29 A30 1.11982575 0.44387126 0.34420449 -0.97075238 0.02184994 0.91794156 > is.array(myArr) [1] TRUE > dim(myArr) [1] 30 > myArr1=array(unlist(datE),dim=c(5,2,3)) > myArr1 , , 1 [,1] [,2] [1,] -0.1264538 -0.3204684 [2,] 0.6836433 0.9874291 [3,] -0.3356286 1.2383247 [4,] 2.0952808 1.0757814 [5,] 0.8295078 0.1946116 , , 2 [,1] [,2] [1,] 2.0117812 0.4550664 [2,] 0.8898432 0.4838097 [3,] -0.1212406 1.4438362 [4,] -1.7146999 1.3212212 [5,] 1.6249309 1.0939013 , , 3 [,1] [,2] [1,] 1.418977 0.44387126 [2,] 1.282136 0.34420449 [3,] 0.574565 -0.97075238 [4,] -1.489352 0.02184994 [5,] 1.119826 0.91794156 > dim(myArr1) [1] 5 2 3 A.K. ----- Original Message ----- From: David Winsemius <dwinsem...@comcast.net> To: David Zastrau <dav...@tzi.de> Cc: r-help@r-project.org Sent: Monday, June 4, 2012 10:45 AM Subject: Re: [R] Convert 2-dim array to 3-dim array On Jun 4, 2012, at 5:08 AM, David Zastrau wrote: > Hello R-users, > > I'd like to load data from a CSV-file to a 3-dimensional array. However > the default seems to be 2-dimensional. No. that is not the problem. > It would also be ok to load the > data and then convert it to a 3-dimensional structure. > > I've been trying: > > dat = read.csv(filename) > myArr = as.array(dat, dim = c(12,100,3)) > > However, I get an error message: > > Error in `dimnames<-.data.frame`(`*tmp*`, value = list(n)) : > invalid 'dimnames' given for data frame A dataframe is a list structure while both array and matrix are expecting the first argument to be an atomic vector. Try this (although it is a blind guess because you have not provided the structure of 'dat' myArr = as.array( unlist(dat), dim = c(12,100,3)) --David. > > > And I don't know how how to set the dimnames. > > I would appreciate any help! > > Best Wishes > Dave > > [[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. David Winsemius, MD West Hartford, CT ______________________________________________ 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. ______________________________________________ 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.
