Dear R users,
I want to aggregate data in the following way:
###
X <- data.frame(u = c("T1","T1","T1","T2"), v=c("a","a","b","a"))
X
library(sqldf)
sqlOut <- sqldf("select count(distinct(v)) from X group by u")
sqlOut
###
Now I want to get the same result without using SQL. How can I achieve
that ?
Thanks for your help,
Gildas
______________________________________________
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.
