# [R] counting matches in two vectors

M.Bezabih at lse.ac.uk M.Bezabih at lse.ac.uk
Thu Jan 23 18:26:33 CET 2014

```Many thanks, Arun.
Res 1 is exactly what I wanted.
Mintewab

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of arun
Sent: 23 January 2014 16:27
To: R help
Subject: Re: [R] counting matches in two vectors

Hi,
May be this helps:
z1 <- factor(z)
res1 <- table(z1[cut(w,breaks=c(-Inf,z,Inf),labels=F)])
res1
#
#-5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 # 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
#21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 # 2  0  0  1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 #or
res2 <- table(z1[findInterval(w,z)])
identical(res1,res2)
#[1] TRUE

A.K.

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?

Mintewab

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