[R] list substring

[Dimitris Rizopoulos]

try this:

x <- c("xxxxx1", "xxxxx2", "yyyyx3")
substr(x, 1, 4)


Best,
Dimitris


calpeda 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
>                              

-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

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