?by perhaps --- Daniel O'Shea <[EMAIL PROTECTED]> wrote: > I have a data frame and one separate vector that is > a grouping variable for the data frame. I would > like to take all rows of the data frame belonging to > each group and then sum the columns with out using a > for statement. > > Something like: take all rows of group 1 then > apply(group1.data,1,sum), but do this without having > to do it separately for each group. Any ideas? > thank you. > > Dan > > ______________________________________________ > R-help@stat.math.ethz.ch 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@stat.math.ethz.ch 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.
