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Dec 20th, 2014
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  1. > df <- data.frame(a=rep(1:3),b=rep(1:3),c=rep(4:6),d=rep(4:6))
  2. > df
  3. a b c d
  4. 1 1 1 4 4
  5. 2 2 2 5 5
  6. 3 3 3 6 6
  7.  
  8. > df1 <- df[,1:2]
  9. > df1
  10. a b
  11. 1 1 1
  12. 2 2 2
  13. 3 3 3
  14. > df2 <- df[,3:4]
  15. > df2
  16. c d
  17. 1 4 4
  18. 2 5 5
  19. 3 6 6
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