Hallo Marine Could you please make your example more reproducible by using set.seed (and maybe smaller)?
If I understand correctly, you want to know if let say row 1 items from df2 (8,16) are both in item column of specific id? If I am correct in guessing, I cannot find another solution than split your df according to id x <- split(df, df$id)[[1]] and for each row of df2 test if within the specified id you can find both numbers. sum(is.element(df2[1,], x$item))==2 [1] FALSE So basically 2 cycles, one for df ids and the other for df2 rows. But maybe somebody will give you more ingenious answer. Cheers Petr > -----Original Message----- > From: R-help <r-help-boun...@r-project.org> On Behalf Of Marine Andersson > Sent: Friday, October 7, 2022 1:58 PM > To: r-help@r-project.org > Subject: [R] Ids with matching number combinations? > > Hi, > > If I have two datasets like this: > df=data.frame("id"=rep(1:10,10, each=10), "item1"=sample(1:20, 100, > replace=T) > df2=data.frame("a"=c(8, 8,10,9, 5, 1,2,1), "b"=c(16,18,11, 19,18, 11,17,12)) > > How do I find out which ids in the df dataset that has a match for both the > numbers occuring in the same row in the df2 dataframe? In the output I would > like to get the matching id and the rownumber from the df2. > > Output something like this > Id Rownr > 2 1 > 5 1 > 7 4 > > My actual problem is more complex with even more columns to be matched and > the datasets are large, hence the solution needs to be efficient. > > Kind regards, > > > > > > N?r du skickar e-post till Karolinska Institutet (KI) inneb?r detta att KI kommer > att behandla dina personuppgifter. H?r finns information om hur KI behandlar > personuppgifter<https://ki.se/medarbetare/integritetsskyddspolicy>. > > > Sending email to Karolinska Institutet (KI) will result in KI processing your > personal data. You can read more about KI's processing of personal data > here<https://ki.se/en/staff/data-protection-policy>. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@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.
______________________________________________ R-help@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.