m<-matrix(seq(1,48),nrow=6,byrow=T) as.vector(t(m)) gives me the correct result.
Any chance you may have already transformed m ? --- On Sat, 6/5/10, steven mosher <mosherste...@gmail.com> wrote: > From: steven mosher <mosherste...@gmail.com> > Subject: Re: [R] Matrix to Vector > To: "Henrique Dallazuanna" <www...@gmail.com> > Cc: r-help@r-project.org > Received: Saturday, June 5, 2010, 2:44 PM > as.vector(t(m)) > [1] 1 9 17 25 33 41 2 10 18 26 34 > 42 3 11 19 27 35 43 4 12 20 28 36 44 > 5 13 21 29 37 45 6 14 22 30 38 46 7 15 23 31 > 39 47 8 16 24 > [46] 32 40 48 > > the result I want is this: > > [1] 1 2 3 4 5 6 > 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 > 24 > 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 > 45 > [46] 46 47 48 > > > > On Sat, Jun 5, 2010 at 11:17 AM, Henrique Dallazuanna > <www...@gmail.com>wrote: > > > Try this: > > > > as.vector(t(m)) > > > > On Sat, Jun 5, 2010 at 3:12 PM, steven mosher <mosherste...@gmail.com>wrote: > > > >> Given a matrix of m*n, I want to reorder it as a > vector, using a row major > >> transpose. > >> > >> so: > >> > >> > m<-matrix(seq(1,48),nrow=6,byrow=T) > >> > m > >> [,1] [,2] [,3] [,4] [,5] > [,6] [,7] [,8] > >> [1,] 1 2 > 3 4 5 6 > 7 8 > >> [2,] > 9 10 11 12 13 14 15 16 > >> > [3,] 17 18 19 20 21 22 23 24 > >> > [4,] 25 26 27 28 29 30 31 32 > >> > [5,] 33 34 35 36 37 38 39 40 > >> > [6,] 41 42 43 44 45 46 47 48 > >> > >> I want to reorder this as a vector copying by row, > so that the final > >> vector > >> has elements ordered thusly: row 1, column 1:N > (m[1,1:n]) maps to > >> row 1-n, and m[2,1:n] maps to row[n+1:2n] ... > >> > >> this obviously is not a solution: as the inherent > column major storage > >> paradigm of a matrix > >> defeats the approach. > >> > dim(m)<-c(48,1) > >> > m > >> [,1] > >> [1,] 1 > >> [2,] 9 > >> [3,] 17 > >> [4,] 25 > >> [5,] 33 > >> [6,] 41 > >> [7,] 2 > >> [8,] 10 > >> [9,] 18 > >> [10,] 26 > >> [11,] 34 > >> [12,] 42 > >> [13,] 3 > >> [14,] 11 > >> [15,] 19 > >> [16,] 27 > >> [17,] 35 > >> [18,] 43 > >> [19,] 4 > >> [20,] 12 > >> [21,] 20 > >> [22,] 28 > >> [23,] 36 > >> [24,] 44 > >> [25,] 5 > >> [26,] 13 > >> [27,] 21 > >> [28,] 29 > >> [29,] 37 > >> [30,] 45 > >> [31,] 6 > >> [32,] 14 > >> [33,] 22 > >> [34,] 30 > >> [35,] 38 > >> [36,] 46 > >> [37,] 7 > >> [38,] 15 > >> [39,] 23 > >> [40,] 31 > >> [41,] 39 > >> [42,] 47 > >> [43,] 8 > >> [44,] 16 > >> [45,] 24 > >> [46,] 32 > >> [47,] 40 > >> [48,] 48 > >> > >> > >> I already have a version that loops through the > data ( this is actually a > >> portion of a data frame ) to reorder > >> this into a vector, but I was hoping there was an > elegant way > >> > >> [[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. > >> > > > > > > > > -- > > Henrique Dallazuanna > > Curitiba-Paraná-Brasil > > 25° 25' 40" S 49° 16' 22" O > > > > [[alternative HTML version deleted]] > > > -----Inline Attachment Follows----- > > ______________________________________________ > 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.
