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

From: Vladimir Eremeev <wl2776_at_gmail.com>
Date: Tue 30 Jan 2007 - 12:01:06 GMT

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
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> 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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Received on Tue Jan 30 23:30:53 2007

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