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

kMan kchamberln at gmail.com
Sat Mar 6 04:30:59 CET 2010


-----Original Message-----
From: baptiste auguie [mailto:baptiste.auguie at googlemail.com] 
Sent: Friday, March 05, 2010 1:08 AM
To: kensuguro
Cc: r-help at r-project.org
Subject: Re: [R] how to make this sequence: 1,2,3,4,5,4,3,2,1

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
> 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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