[R] generate repeats of a vector's elements

[Dimitris Rizopoulos]

try this:

b <- rnorm(4)

ind <- unlist(lapply(seq_along(b), seq_len))
b
b[ind]


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://perswww.kuleuven.be/dimitris_rizopoulos/


----- Original Message ----- 
From: "Chaofeng Kou" <kouchaofeng at gmail.com>
To: <r-help at r-project.org>
Sent: Friday, July 18, 2008 2:21 PM
Subject: [R] generate repeats of a vector's elements


> Dear all,
>
> I have got a question for generating repeats of a vector's elements.
> Please don't hesitate to email me back and say that it is very easy
> although I can't find a method to solve it.
>
> If I have a n-vector b, whose elements are b[1], b[2], ..., b[n], 
> how
> can I generate such a vector
>
>  b[1],   b[1], b[2],   b[1], b[2], b[3],   b[1], b[2], b[3], b[4],
> ......,   b[1], b[2], ..., b[n]
>
> which contains n(n+1)/2 elements.
>
> Thanks very much.
>
> Regards
> Chaofeng Kou
>
> [[alternative HTML version deleted]]
>
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