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Mar 18th, 2018
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  1. x <- c(1,2,3,4)
  2. y <- c(8,9)
  3.  
  4. dt <- data.table(x = x, y = y)
  5.  
  6. x y
  7. 1: 1 8
  8. 2: 2 9
  9. 3: 3 NA
  10. 4: 4 NA
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