[R] counting matched elements in two vectors

[Hervé Pagès]

Hi Mintewab,

With the IRanges packages (from Bioconductor):

   > library(IRanges)
   > countMatches(z, w)
    [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 0 3 1 1 0 1 0 0 0 0 0 0 1 3 
2 0 0 1 0 0
   [39] 0 0 0 0 0 0 0 0

To install the IRanges package:

   source("http://bioconductor.org/biocLite.R")
   biocLite("IRanges")

Cheers,
H.


On 01/23/2014 07:43 AM, M.Bezabih at lse.ac.uk wrote:
>     Hi all,
> I have the following reproducible example
>
> z<-c(-5:40)
> w<-c(11, 11, 12, 14, 14, 14, 15, 16, 18, 25, 26, 26, 26, 27, 27, 30)
>   r<-z %in% w
>
> now r gives me the presence or absence of elements in z that are in w but I am interested in getting the number of times each element in z appears (or doesn't appear)  in w. I want the dimension of my resulting vector to be the same as that of z. How do I do that?
>
>   Thanks in advance
>   Mintewab
>
>
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-- 
Hervé Pagès

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