I see. But please understand that initializing the values is not the same as setting the colnames. How providing this almost-impossible- to-read initialization code helps with respect to your question which is about setting the colnames?
I know people often asked you to show the code in your previous questions on this site. They're right: showing the code helps. But only the code that is relevant to your question. Code that is not relevant to your question is only distracting and confusing. H. On 07/27/2016 11:45 AM, lily li wrote:
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 <mailto: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 <mailto: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 <mailto:hpa...@fredhutch.org> Phone: (206) 667-5791 <tel:%28206%29%20667-5791> Fax: (206) 667-1319 <tel:%28206%29%20667-1319>
-- 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 ______________________________________________ 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.
