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.
