[R] selecting values that are unique, instead of selecting unique values

[Marc Schwartz]

on 06/25/2008 11:29 AM Marc Schwartz wrote:
> on 06/25/2008 11:19 AM Daren Tan wrote:
>>
>> unique(c(1:10,1)) gives 1:10 (i.e. unique values), is there any
>> method to get only 2:10 (i.e. values that are unique) ?
>>
> 
> The easiest might be:
> 
>  > Vec
>  [1]  1  2  3  4  5  6  7  8  9 10  1
> 
>  > Vec[table(Vec) == 1]
> [1]  2  3  4  5  6  7  8  9 10
> 

Correction!

That should be:

 > which(table(Vec) == 1)
  2  3  4  5  6  7  8  9 10
  2  3  4  5  6  7  8  9 10

or if you don't want a named vector:

 > as.vector(which(table(Vec) == 1))
[1]  2  3  4  5  6  7  8  9 10


My initial solution was incorrect and only worked because of the 
ordering of the example vector.

Time for another cup of cawfee...Oy

Marc