a <- c("a","a","a","a","a","a") b <- c("a","a","a","b","b","b") c <- c("1","2","3","1","2","3") df1 <- data.frame(a,b,c) df1 a b c 1 a a 1 2 a a 2 3 a a 3 4 a b 1 5 a b 2 6 a b 3
just want show like this as result.(below)
a a 3 a b 3
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apollo
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Try with `aggregate(c~., df1, max)` after converting the 'c' column to `numeric` – akrun Oct 29 '16 at 10:06
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thank you for quick answer. ^^ – apollo Oct 29 '16 at 10:14