Hello,
   
  Would anyone kindly tell me how to remove the empty element in the vector object?
  For example, 
  > x
[1] "a" ""  ""  "c" "c" "c" "d"
> unique(x)
[1] "a" ""  "c" "d"
How could I get the output like: "a","c","d"? 
   
  Thanks,
   
  Yanqin
   

 		
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