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Mar 25th, 2018
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  1. tt <- textConnection("
  2. x,y
  3. ,1
  4. ?,2
  5. -,3
  6. NA,4")
  7. read.csv(tt, na.strings = c("", "?", "-", "NA"))
  8. #   x y
  9. #1 NA 1
  10. #2 NA 2
  11. #3 NA 3
  12. #4 NA 4
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