[R] how to combine apply and which or alternative ways to do so

[John Kane]

Bon jour,
I am not clear  exactly what you are looking for.  When I first read the email I though you wanted to know if something in vector 2 was in vector 1 but after rereading it I am not sure.  

If I was correct the first time I think something like
vector2 %in% vector1 
will do it. 

If I am wrong, and I think I am, would you explain the problem a bit more, perhaps with some small data vectors?

John Kane
Kingston ON Canada


> -----Original Message-----
> From: balguillaume2883 at gmail.com
> Sent: Fri, 23 Aug 2013 14:37:26 -0700
> To: r-help at r-project.org
> Subject: [R] how to combine apply and which or alternative ways to do so
> 
> Dear useRs,
> 
> I am currently doing some data cleaning and data manipulation and I have
> the
> following problem.
> I have two vectors. Let say the size of the first one is 10 000 (vector
> 1)
> and the size of the second one is 1 000 000 (vector 2).
> 
> I need to know for each cell of vector 1 which cells of vector 2
> correspond.
> 
> I tried to combine the "which" and "apply"  but I dit not succeed and  I
> have no idea about a possible vectorization.
> 
> Can someone help me ?
> 
> Thanks
> 
> Guillaume
> 
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