[R] how to join two arrays using their column names intersection

[Vladimir Eremeev]

dfr1<-merge(ar1,ar2,all=TRUE)
result<-as.matrix(dfr1[apply(dfr1,2,function(x)!any(is.na(x)))])


Federico Abascal wrote:
> 
> Dear all,
> 
> I have a problem that may be someone of you can help. I am a newbie and
> do not find how to do it in manuals.
> 
> I have two arrays, for example:
> 
> ar1 <- array(data=c(1:16),dim=c(4,4))
> ar2 <- array(data=c(1:16),dim=c(4,4))
> colnames(ar1)<-c("A","B","D","E")
> colnames(ar2)<-c("C","A","E","B")
> 
>> ar1
>      A B  D  E
> [1,] 1 5  9 13
> [2,] 2 6 10 14
> [3,] 3 7 11 15
> [4,] 4 8 12 16
>> ar2
>      C A  E  B
> [1,] 1 5  9 13
> [2,] 2 6 10 14
> [3,] 3 7 11 15
> [4,] 4 8 12 16
> 
> 
> I would like to join both arrays only for the columns present in both
> ar1 and ar2 (the intersection). I would like to obtain this:
>      A B  E
> [1,] 1 5 13
> [2,] 2 6 14
> [3,] 3 7 15
> [4,] 4 8 16
> [5,] 5 13  9
> [6,] 6 14 10
> [7,] 7 15 11
> [8,] 8 16 12
> 
> (rows 5-8 correspond to ar2)
> 
> I have tried several things but I am unable to accomplish it. Any
> experienced user could give me some advice, please?
> 
> I have another question: how can I sort the columns of an array
> according to its column names (for ar2, change CAEB to ABCE)?
> 
> Thanks in advance!
> Federico
> 
> ______________________________________________
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> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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