Welcome to R. See ?merge then ?aggregate or require(Hmisc) ?summarize or ?by You can probably find many examples in the archives, if needed.
> -----Original Message----- > From: Michael Graber [mailto:[EMAIL PROTECTED] > Sent: Tuesday, October 25, 2005 3:45 PM > To: R-Mailingliste > Subject: [R] data.frame-question > > > Dear R-List, > I am very new to R and programming itself, so my question may > be easy to > answer for you. > I tried a lot and read through the manuals, but I still have the > following problem: > I have 2 data-frames: > Number<-as.numeric (Number) > Name<-as.character (Name) > TAB1<-data.frame (Name,Number) > - it looks like this:- > Name Number > A 2 > A 3 > A 6 > B 8 > B 12 > B 7 > C 8 > D 90 > E 12 > E 45 > … > Name_singular<-as.character (Name_singular) > TAB2<-data.frame (Name_singular) > # it looks like this: > Name_singular > A > B > C > D > E > -My result should be a data-frame, where the first column is > Name_singular and the second column should be the sum of the numbers > where Name ==Name_singular.- > For example: > TAB3: > Name_singular Sum > A 11 > B 27 > … > - I tried it with for-loops, but I think there must be an easier way.- > I would be very grateful for your help, > > > Michael Graber > > ______________________________________________ > 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
