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Alex Rivera
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I have a data frame like this: x=c("01","01","01","22","22","03","03","03","35","35") y=c("f","f","f","m","m","m","m","m","f","f") df=data.frame(spn=x, sex=y) seems like: spn sex 1 01 f 2 01 f 3 01 f 4 22 m 5 22 m 6 03 m 7 03 m 8 03 m 9 35 f 10 35 f What I'd like to do is to sort the df$spn and let it appears only once. the appropriate df$sex as well, like: spn sex 1 01 f 2 03 m 3 22 m 4 35 f How could I do that? many many thanks!
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