[R] rbind with partially overlapping column names

[Ian Gow]

That approach relies on df1 and df2 not having overlapping values in b.
Slight variation in df2 gives different results:

> df1 <- data.frame(a=c("A","A"),b=c("B","B"))
> df2 <- data.frame(b=c("B","B"),c=c("c","c"))
> merge(df1,df2,all=TRUE)
  b a c
1 B A c
2 B A c
3 B A c
4 B A c


On 5/15/11 11:19 PM, "William Dunlap" <wdunlap at tibco.com> wrote:

>
>> -----Original Message-----
>> From: r-help-bounces at r-project.org
>> [mailto:r-help-bounces at r-project.org] On Behalf Of Jonathan Flowers
>> Sent: Sunday, May 15, 2011 5:41 PM
>> To: r-help at r-project.org
>> Subject: [R] rbind with partially overlapping column names
>> 
>> Hello,
>> 
>> I would like to merge two data frames with partially
>> overlapping column
>> names with an rbind-like operation.
>> 
>> For the follow data frames,
>> 
>> df1 <- data.frame(a=c("A","A"),b=c("B","B"))
>> df2 <- data.frame(b=c("b","b"),c=c("c","c"))
>> 
>> I would like the output frame to be (with NAs where the frames don't
>> overlap)
>> 
>> a      b     c
>> A     B     NA
>> A     B     NA
>> NA   b     c
>> NA   b     c
>> 
>> I am familiar with ?merge and ?rbind, but neither seem to
>> offer a means to
>> accomplish this.
>
>What is wrong with merge(all=TRUE,...)?
>  > merge(df1,df2,all=TRUE)
>    b    a    c
>  1 B    A <NA>
>  2 B    A <NA>
>  3 b <NA>    c
>  4 b <NA>    c
>Rearrange the columns if that is necessary
>  > merge(df1,df2,all=TRUE)[c("a","b","c")]
>       a b    c
>  1    A B <NA>
>  2    A B <NA>
>  3 <NA> b    c
>  4 <NA> b    c
>
>Bill Dunlap
>Spotfire, TIBCO Software
>wdunlap tibco.com 
>> 
>> Thanks in advance.
>> 
>> Jonathan
>> 
>> 	[[alternative HTML version deleted]]
>> 
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>> 
>
>______________________________________________
>R-help at r-project.org mailing list
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>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.