Apply multiple functions to column using tapply

Question

Could someone please point to how we can apply multiple functions to the same column using tapply (or any other method, plyr, etc) so that the result can be obtained in dist

Answer 1

ddply() is conceptually the clearest, but sometimes it is useful to use tapply instead for speed reasons, in which case the following works:

do.call( rbind, tapply(df$MoneySpent, df$User, f) )