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 abc at gmail.com<mailto:abc at gmail.com> John Chan 0909 bcd at yahoo.com<mailto:bcd at yahoo.com> Tim Ma 89089 ...... Table_B: Email Name Sex Phone abc at gmail.com<mailto:abc at gmail.com> John Chan M 0909 khn at hotmail.com<mailto:khn at 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 <chintanu at gmail.com<mailto:chintanu at gmail.com>> wrote:
---------- Forwarded message ---------- From: peter dalgaard <pdalgd at gmail.com<mailto:pdalgd at gmail.com>> Date: Tue, May 1, 2018 ar-help at r-project.org<mailto:r-help at r-project.org>t 9:05 PM Subject: Re: [R] Merging dataframes To: Rui Barradas <ruipbarradas at sapo.pt<mailto:ruipbarradas at sapo.pt>> Cc: Chintanu <chintanu at gmail.com<mailto:chintanu at gmail.com>>, R help <r-help at r-project.org<mailto:r-help at 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 <ruipbarradas at sapo.pt<mailto:ruipbarradas at 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
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