In '?rep' find out about the 'each' argument. Also there is the function 'gl' which creates a factor and offers a shorter syntax for your problem.
If n equals 5 use one of: rep(seq(5), each = 4) gl(5,4) On 19 April 2015 at 15:44, John Sorkin <jsor...@grecc.umaryland.edu> wrote: > Windows 7 64-bit > R 3.1.3 > RStudio 0.98.1103 > > > I am trying to generate a list of length 4n which consists of the > integers 1 to n repeated in groups of four, i.e. > > 1,1,1,1, 2,2,2,2, 3,3,3,3, . . . . , n,n,n,n > > (The spaces in the list are added only for clarity.) > > I can generate the list as follows, but the code must be modified for any > value n, and the code is UGLY! > > c(rep(1,4), rep(2,4), rep(3,4), . . . ,c(n,4)) > > Can anyone help me? > > Thank you, > John > > John David Sorkin M.D., Ph.D. > Professor of Medicine > Chief, Biostatistics and Informatics > University of Maryland School of Medicine Division of Gerontology and > Geriatric Medicine > Baltimore VA Medical Center > 10 North Greene Street > GRECC (BT/18/GR) > Baltimore, MD 21201-1524 > (Phone) 410-605-7119410-605-7119 > (Fax) 410-605-7913 (Please call phone number above prior to faxing) > > > Call > Send SMS > Add to Skype > You'll need Skype CreditFree via Skype > > John David Sorkin M.D., Ph.D. > Professor of Medicine > Chief, Biostatistics and Informatics > University of Maryland School of Medicine Division of Gerontology and > Geriatric Medicine > Baltimore VA Medical Center > 10 North Greene Street > GRECC (BT/18/GR) > Baltimore, MD 21201-1524 > (Phone) 410-605-7119410-605-7119 > (Fax) 410-605-7913 (Please call phone number above prior to faxing) > > > > > John David Sorkin M.D., Ph.D. > Professor of Medicine > Chief, Biostatistics and Informatics > University of Maryland School of Medicine Division of Gerontology and > Geriatric Medicine > Baltimore VA Medical Center > 10 North Greene Street > GRECC (BT/18/GR) > Baltimore, MD 21201-1524 > (Phone) 410-605-7119 > (Fax) 410-605-7913 (Please call phone number above prior to faxing) > > > Confidentiality Statement: > This email message, including any attachments, is for ...{{dropped:16}} ______________________________________________ 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.