Thanks, Peter, Eivind and Lui Sorry, I could not explain it properly in the first go. Trying to simplify it here with an example - Say I have two dataframes as below that are not equally-sized data frames:
Table_A: Email Name Phone a...@gmail.com<mailto:a...@gmail.com> John Chan 0909 b...@yahoo.com<mailto:b...@yahoo.com> Tim Ma 89089 ...... Table_B: Email Name Sex Phone a...@gmail.com<mailto:a...@gmail.com> John Chan M 0909 k...@hotmail.com<mailto:k...@hotmail.com> Rosy M F 7779 ..... Now, I have used - merge (Table_A, Table_B, by="Email", all = FALSE)) - to find only the rows that match from these data frames. Further, I am also interested (using "Email" as the common key) which rows from Table_A did not match with Table_B. I am not sure how to do here. Thanks. On 1 May 2018, at 9:35 pm, Chintanu <chint...@gmail.com<mailto:chint...@gmail.com>> wrote: ---------- Forwarded message ---------- From: peter dalgaard <pda...@gmail.com<mailto:pda...@gmail.com>> Date: Tue, May 1, 2018 ar-h...@r-project.org<mailto:r-help@r-project.org>t 9:05 PM Subject: Re: [R] Merging dataframes To: Rui Barradas <ruipbarra...@sapo.pt<mailto:ruipbarra...@sapo.pt>> Cc: Chintanu <chint...@gmail.com<mailto:chint...@gmail.com>>, R help <r-help@r-project.org<mailto:r-help@r-project.org>> I'd expect more like setdiff(A$key, B$key) and vice versa. Or, if you want the actual rows A[!(A$key %in% B$key),] or for the row numbers which(!(A$key %in% B$key)) -pd > On 1 May 2018, at 12:48 , Rui Barradas > <ruipbarra...@sapo.pt<mailto:ruipbarra...@sapo.pt>> wrote: > > Hello, > > Is it something like this that you want? > > x <- data.frame(a = c(1:3, 5, 5:10), b = c(1:7, 7, 9:10)) > y <- data.frame(a = 1:10, b = 1:10) > > which(x != y, arr.ind = TRUE) > > > Hope this helps, > > Rui Barradas > > On 5/1/2018 11:35 AM, Chintanu wrote: >> Hi, >> May I please ask how I do the following in R. Sorry - this may be trivial, >> but I am struggling here for this. >> For two dataframes (A and B), I wish to identify (based on a primary >> key-column present in both A & B) - >> 1. Which records (rows) of A did not match with B, and >> 2. Which records of B did not match with A ? >> I came across a setdt function while browsing, but when I tried it, it says >> - Could not find function "setdt". >> Overall, if there is any way of doing it (preferably in some simplified >> way), please advise. >> Many thanks in advance. >> regards, >> Tito >> [[alternative HTML version deleted]] >> ______________________________________________ >> R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To >> UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help<https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Dhelp&d=DwMFaQ&c=8acizdFhFtEZX1sSgfHPrQ&r=BxjHz6j-Vy7scfJA1zHGhv3tYe2rG8R184kyAJS45dM&m=jMuWrLr4CoKyPhQHA8AN6zWVm7gVs8LF6UCNstNRRAQ&s=lfIRPP8CRcCepiCqApPDf7wZsVTrG9O2Lt8rByESWFI&e=> >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwMFaQ&c=8acizdFhFtEZX1sSgfHPrQ&r=BxjHz6j-Vy7scfJA1zHGhv3tYe2rG8R184kyAJS45dM&m=jMuWrLr4CoKyPhQHA8AN6zWVm7gVs8LF6UCNstNRRAQ&s=rW2b2LomxW9-0O0Tb34jnePsC_tX-3CpadlJWt9ikQc&e=> >> and provide commented, minimal, self-contained, reproducible code. >> > > ______________________________________________ > R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To > UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help<https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Dhelp&d=DwMFaQ&c=8acizdFhFtEZX1sSgfHPrQ&r=BxjHz6j-Vy7scfJA1zHGhv3tYe2rG8R184kyAJS45dM&m=jMuWrLr4CoKyPhQHA8AN6zWVm7gVs8LF6UCNstNRRAQ&s=lfIRPP8CRcCepiCqApPDf7wZsVTrG9O2Lt8rByESWFI&e=> > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwMFaQ&c=8acizdFhFtEZX1sSgfHPrQ&r=BxjHz6j-Vy7scfJA1zHGhv3tYe2rG8R184kyAJS45dM&m=jMuWrLr4CoKyPhQHA8AN6zWVm7gVs8LF6UCNstNRRAQ&s=rW2b2LomxW9-0O0Tb34jnePsC_tX-3CpadlJWt9ikQc&e=> > and provide commented, minimal, self-contained, reproducible code. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd....@cbs.dk<mailto:pd....@cbs.dk> Priv: pda...@gmail.com<mailto:pda...@gmail.com> IMPORTANT NOTICE: The information in this email (and any attachments) is confidential. 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