I think the OP does not want to list duplicate records. Perhaps > merge(unique(df1), df2, all.y=TRUE) v1 v2 ind 1 1 83 1 2 1 84 1 3 2 83 NA 4 2 84 NA 5 3 83 NA 6 3 84 NA 7 4 83 NA 8 4 84 NA
------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of PIKAL Petr Sent: Tuesday, January 13, 2015 2:14 AM To: npretnar; r-help@r-project.org Subject: Re: [R] Complex merging problems Hi I do not understand what you want to achive with this. > df2$v3 <- ifelse(df2$v1 %in% df1$v1 & df2$v2==df2$v1, 1, 0). You compare v1 and v2 from data frame df2 to column v1 in data frame df1? It is true only in case where df2$v1 equals df2$v2. In case you mean that you want check equality of rows in both data frames you can use this > df1$ind<-1 > merge(df1, df2, all.y=T) v1 v2 ind 1 1 83 1 2 1 83 1 3 1 84 1 4 1 84 1 5 2 83 NA 6 2 84 NA 7 3 83 NA 8 3 84 NA 9 4 83 NA 10 4 84 NA Cheers Petr > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of > npretnar > Sent: Tuesday, January 13, 2015 7:07 AM > To: r-help@r-project.org > Subject: [R] Complex merging problems > > Hello, > > I have two data frames structured as follows: > > df1 > > v1 v2 > 1 83 > 1 83 > 1 84 > 1 84 > 1 85 > 1 85 > 2 90 > 2 91 > 2 91 > 2 91 > 2 92 > 4 89 > 4 89 > 4 90 > 4 90 > > df2 > > v1 v2 > 1 83 > 2 83 > 3 83 > 4 83 > 1 84 > 2 84 > 3 84 > 4 84 > > ... etc. > > I am trying to create an indicator variable in df2 to indicate whether > the record is identified in df1. I just want to know if it appears > once. The problem seems to be that df1 contains multiple records with > the same data. I am attempting the following: > > df2$v3 <- ifelse(df2$v1 %in% df1$v1 & df2$v2==df2$v1, 1, 0). > > However, I get the following warning message: > > Warning message: > In df2$v2 == df1$v1 : > longer object length is not a multiple of shorter object length > > Nonetheless, the function outputs all 0's to df2$v3. If anybody has any > suggestions with this, I would greatly appreciate it. > > Thanks, > > - Nick Pretnar > npret...@gmail.com > > ______________________________________________ > 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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. 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