You can use ave(), like this:

 ke$maxa <- ave(ke$a, as.factor(ke$patid), FUN=max)



greetings,
remko



--
View this message in context: 
http://r.789695.n4.nabble.com/manipulating-longitudinal-data-in-r-tp4649855p4650138.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
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.

Reply via email to