Is TAB3 <- as.data.frame(with(TAB1, tapply(Number, Name, sum))) colnames(TAB3) <- c("Name_singular", "Sum")
what you are looking for? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Graber Sent: 25 October 2005 09:45 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 ******************** Nedbank Limited Reg No 1951/000009/06 Directors: WAM Clewlow (Chairman) Prof MM Katz (Vice-chairman) ML Ndlovu (Vice-chairman) TA Boardman (Chief Executive) CJW Ball MWT Brown RG Cottrell BE Davison N Dennis (British) MA Enus-Brey Prof B de L Figaji RM Head (British) RJ Khoza JB Magwaza ME Mkwanazi JVF Roberts (British) CML Savage GT Serobe JH Sutcliffe (British) Company Secretary: GS Nienaber 16.08.2005 This email and any accompanying attachments may contain confidential and proprietary information. This information is private and protected by law and, accordingly, if you are not the intended recipient, you are requested to delete this entire communication immediately and are notified that any disclosure, copying or distribution of or taking any action based on this information is prohibited. Emails cannot be guaranteed to be secure or free of errors or viruses. The sender does not accept any liability or responsibility for any interception, corruption, destruction, loss, late arrival or incompleteness of or tampering or interference with any of the information contained in this email or for its incorrect delivery or non-delivery for whatsoever reason or for its effect on any electronic device of the recipient. If verification of this email or any attachment is required, please request a hard-copy version. ******************** [[alternative HTML version deleted]] ______________________________________________ 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