Re: [R] generate repeats of a vector's elements

From: Antje <niederlein-rstat_at_yahoo.de>
Date: Fri, 18 Jul 2008 14:40:50 +0200

I would do it like this but I'm curious to see whether it can be easier solved :-)

b <- c(1:10)
vector_list <- lapply(1:length(b), FUN = function(x) { b[1:x] }))

(for everything in a large vector just apply "unlist" to the "vector_list")

Antje

Chaofeng Kou schrieb:
> 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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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. Received on Fri 18 Jul 2008 - 13:02:11 GMT

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