Hi Jorge,

Thanks so much! Exactly what I wanted. Finally I wrote:

for(i in 1976:1981){
   PE.files_01_7681 <- paste("val_mapped_petpe_", 1976:i, "01.txt", sep="")
}

Cheers,
Bea


On 21/04/2014 10:46, Jorge I Velez wrote:
> Hi Beatriz,
>
> Try
>
> paste("val_mapped_petpe_", 1976:1981, "01.txt", sep="")
>
> Best,
> Jorge.-
>
>
> On Mon, Apr 21, 2014 at 6:43 PM, Beatriz R. Gonzalez Dominguez 
> <aguitatierra@hotmail.com <mailto:aguitatierra@hotmail.com>> wrote:
>
>     Dear all,
>
>     I'm trying to create a loop to select a series of files into my
>     computer but I haven't been successful until now. I've looked into
>     different possibilities but none has worked. I'd appretiate if you
>     could help me by providing me with some ideas.
>
>     Basically what  I'd like to do is to create a character string
>     variable [1:5], same as the one that could be obtained with
>     'list.files', but using a 'for' loop.
>
>     This is one of the things I've tried but obviously doesn't yield
>     the results I would like:
>
>     for(i in 1976:1981){
>       PE.files_01_7681 <- paste("val_mapped_petpe_", i, "01.txt", sep="")
>      paste(PE.files_01_7681[i])
>     }
>
>     Many thanks!
>
>     ______________________________________________
>     R-help@r-project.org <mailto:R-help@r-project.org> mailing list
>     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.
>
>


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