[R] unique() duplicate() not what i am looking for

[Fox, John]

Dear Knut,

Here's one way:

> as.vector((table(Dup) > 1)[Dup])
[1]  TRUE  TRUE  TRUE FALSE  TRUE  TRUE  TRUE FALSE

Someone will probably think of something cleverer.

I hope this helps,
 John

--------------------------------------
John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
Web: socialsciences.mcmaster.ca/jfox/



> -----Original Message-----
> From: R-help [mailto:r-help-bounces using r-project.org] On Behalf Of Knut
> Krueger
> Sent: Monday, November 19, 2018 9:42 AM
> To: r-help using r-project.org >> r-help mailing list <r-help using r-project.org>
> Subject: [R] unique() duplicate() not what i am looking for
> 
> It should be simple but i do not find the right keywords:
> 
> 
> Dup =  c(1,2,3,4,1,2,3,5)
> 
> I need 4,5 as result
> 
> unique(Dup) gives me [1] 4 1 2 3 5
> 
> duplicated(Dup) gives me
> [1] FALSE FALSE FALSE FALSE  TRUE  TRUE  TRUE FALSE
> 
> I need
> [1] TRUE TRUE TRUE FALSE  TRUE  TRUE  TRUE FALSE
> 
> 
> Kind regards Knut
> 
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