[R] intersection of two matrices

[bartjoosen]

? merge 


complexkid wrote:
> 
> Hi,
> I have two matrices as follow:
> matrix A =
> 
> a=matrix(c(c("abc","abc","bcd","bcd","bce","bce"),c("a1","d2","d1","d2","a1","a2")),6,2)
> 
> and matrix B which contains pair of values :
>  b=matrix(c(c("a1","a2"),c("a1","d2")),2,2)
> 
>  In short, I wish to find out pairs of values in matrix a[,2] having
> same value in a[,1], which occur as a row in matrix b, so that the
> output becomes :
> abc
> bce, or
> 
> even better
> abc a1 d2
> bce a1 a2
> 
>  How can I do that?
> cheers,
> Joshi
> 
> _________________________________
> 
> Ms Tejal Joshi
> 
> Researcher
> Center for Biological Sequence Analysis
> Technical University of Denmark
> Kemitorvet, Building 208
> DK-2800 Kgs. Lyngby, Denmark
> Phone: +45 4525 6148
> tejal at cbs.dtu.dk
> www.cbs.dtu.dk
> 
> ______________________________________________
> 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.
> 
> 

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