You mean like this? mydata <- data.frame(aa=1:5, bb=1:5) mydata[,3] <- mydata[,1] + mydata[,2] mydata
--- On Sat, 4/16/11, ozgrerg <ozgr...@gmail.com> wrote: > From: ozgrerg <ozgr...@gmail.com> > Subject: [R] adding two colmns of a data frame > To: r-help@r-project.org > Received: Saturday, April 16, 2011, 4:22 PM > It seems very simple but I could not > find the way. I just want to add two > columns of a data frame. I am doing the below operation: > > data$C=transform(data, data$A+data$B) > > However that return as a data frame. I will be glad if ypu > help. Thanks a > lot > > > > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/adding-two-colmns-of-a-data-frame-tp3454556p3454556.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. > ______________________________________________ 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.
