[R] generate a list as follows: 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, . . . . ., n, n, n, n

[Gerrit Eichner]

Hi, John,

doesn't

n <- <your number>
lapply( 1:n, rep, each = 4)

do what you need?

  Hth  --  Gerrit


On Sat, 18 Apr 2015, John Sorkin 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) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
>
>
> Confidentiality Statement:
> This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message.
> ______________________________________________
> R-help at 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.