Hi, I'm not sure what you actually want from your email (following the posting guide is a good way of helping you explain things to the rest of us in a way we understand - it might even answer your question!
I'm only a beginner at R so no doubt one of our expert colleagues will help me... > fred <- data.frame() > fred <- edit(fred) > fred A B C D E 1 1 2 X Y 1 2 2 3 G L 1 3 3 1 G L 5 > fred[,3] [1] X G G Levels: G X > fred[fred[,3]=="G",] A B C D E 2 2 3 G L 1 3 3 1 G L 5 so at this point I can create a new dataframe with column 3 (C) == "G"; either explicitly or implicitly... and if I want to calculate the sum() of column E, then I just say something like... > sum(fred[fred[,3]=="G",][,5]) [1] 6 > now naturally being a bit clueless at manipulating stuff in R, I didn't know how to do this before I started... and you guys only get to see the lines that I typed in and got a "successful" result... according to section 6 of the "Introduction to R" manual which comes with R, I could also have said > sum(fred[fred$C=="G",]$E) [1] 6 Hmmm.... I wonder would it be reasonable to put an example of this type into section 2.7 of the "Introduction to R"? cheers! Sean On 18/08/05, A. Mani <[EMAIL PROTECTED]> wrote: > Hello, > I want to avoid loops in the following situation. There is a 5-col > dataframe with col headers alone. two of the columns are non-numeric. The > problem is to calculate statistics(scores) for each element of one column. > The functions depend on matching in the other non-numeric column. > > A B C E F > 1 2 X Y 1 > 2 3 G L 1 > 3 1 G L 5 > and so on ...30000+ entries. > > I need scores for col E entries which depend on conditional implications. > > > Thanks, > > A. Mani > Member, Cal. Math. Soc > > ______________________________________________ > 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 > ______________________________________________ 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