On Jan 25, 2013, at 1:12 PM, emorway wrote: > Undoubtedly this question has been asked before, I just can't seem to find > the combination of search terms to produce it. I'm trying to resize a > dataset that is pulled into R using read.table. However, I think the same > problem can be produced using matrix: > > x<-matrix(1:64,8) > x > # [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] > #[1,] 1 9 17 25 33 41 49 57 > #[2,] 2 10 18 26 34 42 50 58 > #[3,] 3 11 19 27 35 43 51 59 > snipped > > The true order of data in the larger problem I'm working with is actually > transposed, like so: > x<-t(x) > x > # [,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 > ... snipped > I'm trying to resize the data (in this example, a matrix) to say a 16 x 4 > matrix while preserving the consecutive order of the individual elements in > a left-to-right top-to-bottom fashion. The example below is wrong because > the first row should be "1 2 3 4", how can I make this happen? It would > also be nice to make a 4 x 16 matrix where the first row contains the values > of x[1,1:8] followed by x[2,1:8]. I'm guessing there is a 1 liner of R code > for this type of thing so I don't have to resort to nested for loops? > > y<-matrix(x,nrow=16,ncol=4) > y > # [,1] [,2] [,3] [,4] > # [1,] 1 3 5 7 > # [2,] 9 11 13 15 > # [3,] 17 19 21 23 > ... snipped > > What's wrong with:
X1.4 <- t( matrix(x, nrow=4) ) -- David Winsemius Alameda, CA, USA ______________________________________________ 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.
