[R] how to make this sequence: 1,2,3,4,5,4,3,2,1

baptiste auguie baptiste.auguie at googlemail.com
Fri Mar 5 09:07:37 CET 2010

c(x <- 1:5, rev(x[-length(x)]))

On 5 March 2010 07:04, kensuguro <magronbass at gmail.com> wrote:
> I'm just beginning R, with book Using R for Introductory Statistics, and one
> of the early questions has me baffled.  The question is, create the
> sequence: 1,2,3,4,5,4,3,2,1 using seq() and rep().
> Now, as a programmer, I am punching myself to not be able to figure it out..
> I mean, as simple as a for loop, but using seq, I am stumped.  I would think
> c(1:5, 4:1) would be the brute force method with very non intelligent
> coding..  there has to be a way to make the "turning point" (in this case 5)
> parametric right?  So you could change it later and the sequence will
> reflect it.
> --
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Baptiste Auguié

Departamento de Química Física,
Universidade de Vigo,
Campus Universitario, 36310, Vigo, Spain

tel: +34 9868 18617

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