Yes, df is your data.frame.
tapply(df$y, df$x, sum) On 14/02/07, d. sarthi maheshwari <[EMAIL PROTECTED]> wrote: > > Hi > > Sorry if this is a wrong post in the forum. Please suggest if this is a > correct forum to discuss R related basic problem. > > I wanted to perform the following task by using R: > > e.g. > input data.frame > x y > ============ > a 10 > b 20 > a 10 > a 10 > b 15 > b 15 > b 20 > > In o/p i need > > x y > ========= > a 30 > b 70 > > Currently i am storing the data.frame as a database table by using > sqlSave. > Then I am retrieving the data using sqlQuery command. In the query I am > using Group by function of SQL. > > is there any smarter way to this in R? > > > -- > thanks > Sar > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] 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. > -- Henrique Dallazuanna Curitiba-Paraná Brasil [[alternative HTML version deleted]]
______________________________________________ [email protected] 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.
