[R] merging multiple .csv files

[PIKAL Petr]

Hi.


merge has parameters all, all.x and all.y which should specify if you want to use common or all values from the data frame.

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of pooja sinha
> Sent: Tuesday, December 15, 2020 11:14 PM
> To: Bert Gunter <bgunter.4567 using gmail.com>
> Cc: r-help mailing list <r-help using r-project.org>
> Subject: Re: [R] merging multiple .csv files
> 
> I know that but I do not want to merge them sequentially because I may lose
> some rows which are present in one file while the other doesn't have. I
> googled and found something called multmerge but the code is not working
> for me. I used the following:
> 
> path <-"P:/Documents/Puja Desktop items/Documents/RESULTS/est meth
> results/Final_est_meth_data_rn6/WGBS_exon_sort_CHG/merge_csv"
> 
> 
> filenames <- list.files(path = path)
> 
> View(filenames)
> multmerge = function(path){
>   filenames=list.files(path=path, full.names=TRUE)
>   datalist = lapply(filenames, function(x){read.csv(file=x,header=T)})
>   Reduce(function(x,y) {merge(x,y)}, datalist)
> }
> 
> full_data = multmerge("~/P:/Documents/Puja Desktop
> items/Documents/RESULTS/est meth
> results/Final_est_meth_data_rn6/WGBS_exon_sort_CHG/merge_csv")
> 
> But after running the full_data, the folder is empty.
> 
> Thanks,
> Puja
> 
> On Tue, Dec 15, 2020 at 4:51 PM Bert Gunter <bgunter.4567 using gmail.com>
> wrote:
> 
> > ?read.csv to read your csv files in data frames
> > ?merge to merge them (sequentially).
> >
> >
> > Bert Gunter
> >
> > "The trouble with having an open mind is that people keep coming along
> and
> > sticking things into it."
> > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
> >
> >
> > On Tue, Dec 15, 2020 at 1:36 PM pooja sinha <pjsinha07 using gmail.com>
> wrote:
> >
> >> Hi All,
> >>
> >> I have 10 .csv files containing 12 to 15 columns but have some columns in
> >> common. I need to join all of my .csv files into one using one common
> >> column ‘Pos’. The header portion of my .csv files looks as shown below:
> >>
> >> Chrom Pos Avg Stdev  A15_3509.C A31_3799.C A32_3800.C A35_3804.C
> Gene ID
> >> Class ExNum
> >>
> >>  Can anyone help me in getting the code for the above problem. Any help
> >> will be highly appreciated.
> >>
> >>
> >> Thanks,
> >>
> >> Puja
> >>
> >>         [[alternative HTML version deleted]]
> >>
> >> ______________________________________________
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> >> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >>
> >
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.