[R] Merging two datasets

[John Kane]

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, rkevinburton at charter.net <rkevinburton at charter.net> wrote:

> From: rkevinburton at charter.net <rkevinburton at charter.net>
> Subject: Re: [R] Merging two datasets
> To: "Henrique Dallazuanna" <wwwhsd at gmail.com>, "Shreyasee Pradhan" <shreyasee.pradhan at gmail.com>
> Cc: r-help at 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 <wwwhsd at gmail.com> wrote: 
> > Try using:
> > 
> > merge(df1, df2, all = TRUE)
> > 
> > On Wed, Aug 6, 2008 at 11:15 AM, Shreyasee Pradhan
> > <shreyasee.pradhan at gmail.com> 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 at 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 at 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 at 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.


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