[R] counting matched elements in two vectors
Peter Langfelder
peter.langfelder at gmail.com
Fri Jan 24 01:56:51 CET 2014
Here's a solution:
# This gives a vector of counts (if z is a data frame, first convert
it to a matrix)
res = sapply(as.vector(z), function(x) sum(w==x))
# This copies the dimensions of the variable 'z' to 'res':
dim(res) = dim(z)
Peter
On Thu, Jan 23, 2014 at 7:43 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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