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

From: Marc Schwartz <marc_schwartz_at_comcast.net>
Date: Wed, 25 Jun 2008 11:37:12 -0500

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



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