Hi, Try: as.table(by(warpbreaks[,1],warpbreaks[,-1],sum))
#or to convert to data.frame as.data.frame(as.table(by(warpbreaks[,1],warpbreaks[,-1],mean))) A.K. On Friday, December 20, 2013 12:39 PM, Onur Uncu <onuru...@gmail.com> wrote: I used the by() function on a data.frame to get sums of the data grouped by 2 factors. The function worked however the output is in a class called 'by'. Not familiar with this class. How can I turn the output into a nice table where columns represent values of factor1, row represent values of factor2 and the entries in the table are the sums that were calculated using the by function? I did some web search which suggested using do.call(rbind, datframe_object) but this command gave the following error: "Second argument must be a list"... Thank you. ______________________________________________ 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.
