[R] Pairwise intersect comparisons of list elements

[jim holtman]

yet another way:

> mapply(function(x,y)length(intersect(x,y)), q, w)
[1] 0 1 3 3


On Thu, Nov 20, 2008 at 7:15 PM, Stefan Th. Gries <stgries at gmail.com> wrote:
> Hi all
>
> I have two lists that have the same number of numeric vectors such as:
> q<-list(1, 2:3, 4:6, 7:10)
> w<-list(0, 1:2, 3:7, 8:10)
>
> What I want to do is create a vector desired.result that looks like
> this but I am thinking there must be some kind of non-loop /
> "\\wapply" way to so ...
>
> desired.result<-numeric()
> for (i in 1:4) desired.result[i]<-length(intersect(q[[i]], w[[i]]))
> desired.result
>
> Any ideas? Thx,
> STG
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?