[datatable-help] join vignette for data.table

[Arunkumar Srinivasan]

In the works. I’ve not yet managed to finish.

require(data.table)
A = data.table(x=1:2, y=3:4)
B = data.table(x=2:3, y=3:4)

anti-join:

A[!B, on="x"] # equivalently A[!B, .SD, on="x"]

semi-join:

A[B, .SD, nomatch=0L, on="x"]

-- 
Arun

On 21 December 2015 at 17:09:22, statquant3 (statquant at outlook.com) wrote:

Hello, is there a join vignette for data.table ?  
I realize that I am now more and more using dplyr just for semi_join and  
anti_join.  
Is there any plan to write those sugar function ?  
Happy to do it here and get feedback.  

C.  



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