Re: [R] apply a function over a factor

Thanks! That's what I need. On Tue, Dec 29, 2009 at 1:33 PM, Dimitris Rizopoulos < d.rizopou...@erasmusmc.nl> wrote: > have a look at ?ave(), e.g., > > A <- 1:10 > B <- factor(c(1,2,2,4,4,4,7,7,7,7)) > > ave(A, B) > > > I hope it helps. > > Best, > Dimitris > > > farida...@gmail.com wrote: > >> D

Re: [R] apply a function over a factor

have a look at ?ave(), e.g., A <- 1:10 B <- factor(c(1,2,2,4,4,4,7,7,7,7)) ave(A, B) I hope it helps. Best, Dimitris farida...@gmail.com wrote: Dear R experts, I would like to substitute the values of a vector, say A, with the average values taken over a factor For example, lets assum

[R] apply a function over a factor

Dear R experts, I would like to substitute the values of a vector, say A, with the average values taken over a factor For example, lets assume A [1] 1 2 3 4 5 6 7 8 9 10 B [1] 1 2 2 4 4 4 7 7 7 7 Levels: 1 2 4 7 I need to have 1.0 2.5 2.5 5.0 5.0 5.0 8.5 8.5 8.5 8.5 8.5 Thank you