[R] little question

Thomas Lumley tlumley at u.washington.edu
Thu Apr 26 19:50:35 CEST 2001

On Thu, 26 Apr 2001, Olivier Martin wrote:

> Hi all,
> i have a little pb but i don t find  how i can solve it..
> this is..
> i have two vectors x and yn and they don t have the same length...
> (i suppose length(x)>length(y))
> this is what i want to do.
> i suppose that
> x=c(10,1,2,3,7,9,1,4,2,11,2,10) and y=c(1,2,4,10)
> i want to find all the numbers of rows i of x for which x[i] exists in y
> ...
>  i.e. in this case ...rep=(1,2,3,7,8,9,11,12)

which(x %in% y)


Thomas Lumley			Asst. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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