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-bounces at r-project.org] On Behalf Of PIKAL Petr
Sent: Tuesday, January 13, 2015 2:14 AM
To: npretnar; r-help at 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-bounces at r-project.org] On Behalf Of
> npretnar
> Sent: Tuesday, January 13, 2015 7:07 AM
> To: r-help at 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
> npretnar at gmail.com
>
> ______________________________________________
> R-help at 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.
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