Hi Julia, or you can use colSums on an appropriate sub-data.frame:
colSums(dataset[,c(1,2)]) HTH, Stephan Jorge Ivan Velez schrieb:
Dear Julia, Try this: DF<-read.table(textConnection(" x1 x2 x3 1 2 3 4 5 6 7 8 9"),header=TRUE) closeAllConnections() DF$x4<-DF$x1+DF$x2 DF HTH, Jorge On Tue, Jan 20, 2009 at 2:12 PM, Julia Zhou <ms.juliaz...@gmail.com> wrote:Hi, I would like to operate on certain columns in a dataframe, but not others. My data looks like this: x1 x2 x3 1 2 3 4 5 6 7 8 9 I want to create a new column named x4 that is the sum of x1 and x2, but NOT x3. I looked at colSums and apply, but those functions seem to use all the columns in a dataframe. How do I only use select columns? If it helps, in Stata this would be gen x4 = x1 + x2. Thanks! ______________________________________________ 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.[[alternative HTML version deleted]] ______________________________________________ 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.
