Thanks. I shorten a more complex matrix to this example, but use the original structure of the code. The original matrix has all characters instead of 1:5.
On Wed, Jul 27, 2016 at 12:42 PM, Hervé Pagès <hpa...@fredhutch.org> wrote: > On 07/27/2016 11:40 AM, Hervé Pagès wrote: > >> Hi, >> >> On 07/27/2016 11:17 AM, lily li wrote: >> >>> Hi all, >>> >>> I want to ask that how to create column names for a matrix. For example, >>> the matrix below, the column names should be: 1-A, 1-B, 1-C, 1-D, 2-A, >>> 2-B, >>> 2-C, 2-D, 3-A, etc. Thanks for your help. >>> >>> chars = c('A','B','C','D') >>> matrix1 = matrix(nrow = length(1:100), ncol = length(1:5)*length(chars)) >>> k = 0 >>> for(i in seq(1:length(1:5))){ >>> for(j in seq(1:length(chars))){ >>> k = k+1 >>> matrix1[,k] = c(1:100)[k] >>> } >>> } >>> >> >> Also how could you possibly use such level of code obfuscation to >> perform such simple initialization of your matrix? >> >> My 1st advice would be that you slow down and take the time to compare >> seq(1:length(1:5)) with 1:length(1:5) with 1:5. It will be a great >> learning experience! >> >> As for initializing your matrix, what about doing >> >> ncol <- 5 * length(chars) >> matrix1 <- matrix(seq_len(ncol), nrow=100, ncol=ncol, byrow=TRUE) >> >> instead? >> >> Then set the colnames with: >> >> colnames(matrix1) <- paste(rep(1:5, length(chars)), chars, sep="-") >> > > or maybe > > colnames(matrix1) <- paste(rep(1:5, each=length(chars)), chars, sep="-") > > is what you're after. > > H. > > > >> Cheers, >> H. >> >> >>> [[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. >>> >>> >> > -- > Hervé Pagès > > Program in Computational Biology > Division of Public Health Sciences > Fred Hutchinson Cancer Research Center > 1100 Fairview Ave. N, M1-B514 > P.O. Box 19024 > Seattle, WA 98109-1024 > > E-mail: hpa...@fredhutch.org > Phone: (206) 667-5791 > Fax: (206) 667-1319 > [[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.