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

John Sorkin JSorkin at grecc.umaryland.edu
Sun Apr 19 05:12:41 CEST 2015

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 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
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing) 

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