[datatable-help] duplicated, with a key

[Matthew Dowle]

Yes, that's documented in ?duplicated.data.table.

Matthew

On Sat, 2012-03-03 at 17:53 -0500, Joseph Voelkel wrote:
> Is the second result by design? I found it confusing:
> 
> x<-data.table(a=c(1:5,1:5),b=1:10)
> sum(duplicated(x)) # 0, as expected
> setkey(x,a)
> sum(duplicated(x)) # 5

> Thanks,

> Joe 
> 
> Joseph G. Voelkel, Ph.D.
> 
> Graduate Program Chair, Center for Quality and Applied Statistics
> 
> Kate Gleason College of Engineering
> 
> Rochester Institute of Technology
> 
> V 585-475-2231
> 
> F 585-475-5959
> 
> joseph.voelkel at rit.edu
> 
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