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
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
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