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]]
______________________________________________ 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.
