You need to do the merge and then sum in a separate operation I think you may have to rename the columns. See ?names
--- On Wed, 8/6/08, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > From: [EMAIL PROTECTED] <[EMAIL PROTECTED]> > Subject: Re: [R] Merging two datasets > To: "Henrique Dallazuanna" <[EMAIL PROTECTED]>, "Shreyasee Pradhan" <[EMAIL > PROTECTED]> > Cc: r-help@r-project.org > Received: Wednesday, August 6, 2008, 12:10 PM > I looked at 'merge'. What if df1 and df2 are > data.frames and I want to merge on on column and sum on > another? Say df1 and df2 are data.frames with columns > 'ID1', 'ID2', 'ID3', and > 'Qty'. I want to 'merge' the data frames > (and produce a new data.frame) if there is a matching > 'ID2' in each data.frame and if there is sum the > 'Qty' value from each data fame. First, I don't > see a function that can be applied during the merge. Maybe > that has to be done in a separate step. Next, > 'merge' seems to produce a data.frame with the > columns renamed. How can I preserve the column names? > > Thank you. > > > Kevin > > ---- Henrique Dallazuanna <[EMAIL PROTECTED]> wrote: > > Try using: > > > > merge(df1, df2, all = TRUE) > > > > On Wed, Aug 6, 2008 at 11:15 AM, Shreyasee Pradhan > > <[EMAIL PROTECTED]> wrote: > > > I am facing a problem in merging two datasets. > > > I have given codes to the names which are common > in both the datasets and > > > also to those which are uncommon. > > > When I gave gave the following command > > > > > > merge(df1,df2) > > > > > > only those rows and columns were merged which > were having common codes. > > > When I viewed the results, only common codes are > seen and the remaining > > > entries are not seen. > > > > > > Can anyone guide me in this regards? > > > How should I merge these two datasets completely > without loss of any > > > information? > > > > > > Thanks, > > > Shreyasee > > > > > > [[alternative HTML version deleted]] > > > > > > ______________________________________________ > > > 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. > > > > > > > > > > > -- > > Henrique Dallazuanna > > Curitiba-Paraná-Brasil > > 25° 25' 40" S 49° 16' 22" O > > > > ______________________________________________ > > 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. __________________________________________________________________ Looking for the perfect gift? Give the gift of Flickr! http://www.flickr.com/gift/ ______________________________________________ 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.
