[R] Unique subsetting question

[AndrewPage]

How about this:


s = c("aa", "bb", "cc", "", "aa", "dd", "", "aa") 

n = c(2, 3, 5, 6, 7, 8, 9, 3) 

b = c(TRUE, FALSE, TRUE, TRUE, FALSE, TRUE, TRUE, FALSE) 

df = data.frame(n, s, b)       # df is a data frame 


I want to display df with no value in s occurring more than once.  Also, I
want to delete the rows where s contains "".
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