Dear celpeda,
Try this:
 x = c( "xxxxx1", "xxxxx2", "yyyyx3")
substr(x,1,4)
[1] "xxxx" "xxxx" "yyyy"

See ?substr for more details.

HTH,

Jorge


On Wed, Apr 1, 2009 at 9:30 AM, calpeda <mauro.biasolo@calpeda.it> wrote:

>
> hi
> I ve a list of item x = ( "xxxxx1"
>                               "xxxxx2"
>                               "yyyyx3")
>
> I need to extract a new vector y  = ( "xxxx",
>                                                   "xxxx",
>                                                   "yyyy"
> )
> I mean, for each item I need to extract the first 4 digit
> How is that possible?
>
> Thank you
>
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