Stacking columns of a matrix is a standard operation in multilinear algebra, usually written as the operator vec(). I checked to see if there is an R package that deals with multilinear algebra. I found rTensor, which has a function vec(). So, yet another way to accomplish what you want would be:
> library(rTensor) > vec(as.tensor(x)) Eric On Sun, Aug 6, 2023 at 5:05 AM Bert Gunter <bgunter.4...@gmail.com> wrote: > > Or just dim(x) <- NULL. > (as matrices in base R are just vectors with a dim attribute stored in > column major order) > > ergo: > > > x > [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 > > x<- 1:20 ## a vector > > is.matrix(x) > [1] FALSE > > dim(x) <- c(5,4) > > is.matrix(x) > [1] TRUE > > attributes(x) > $dim > [1] 5 4 > > > ## in painful and unnecessary detail as dim() should be used instead > > attr(x, "dim") <- NULL > > is.matrix(x) > [1] FALSE > > x > [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 > > ## well, you get it... > > -- Bert > > On Sat, Aug 5, 2023 at 5:21 PM Iris Simmons <ikwsi...@gmail.com> wrote: > > > > You could also do > > > > dim(x) <- c(length(x), 1) > > > > On Sat, Aug 5, 2023, 20:12 Steven Yen <st...@ntu.edu.tw> wrote: > > > > > I wish to stack columns of a matrix into one column. The following > > > matrix command does it. Any other ways? Thanks. > > > > > > > x<-matrix(1:20,5,4) > > > > x > > > [,1] [,2] [,3] [,4] > > > [1,] 1 6 11 16 > > > [2,] 2 7 12 17 > > > [3,] 3 8 13 18 > > > [4,] 4 9 14 19 > > > [5,] 5 10 15 20 > > > > > > > matrix(x,ncol=1) > > > [,1] > > > [1,] 1 > > > [2,] 2 > > > [3,] 3 > > > [4,] 4 > > > [5,] 5 > > > [6,] 6 > > > [7,] 7 > > > [8,] 8 > > > [9,] 9 > > > [10,] 10 > > > [11,] 11 > > > [12,] 12 > > > [13,] 13 > > > [14,] 14 > > > [15,] 15 > > > [16,] 16 > > > [17,] 17 > > > [18,] 18 > > > [19,] 19 > > > [20,] 20 > > > > > > > > > > ______________________________________________ > > > 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. > > > > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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. > > ______________________________________________ > 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. ______________________________________________ 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.
