search for: dtf2

Hi, I have two data frames. One is like > dtf = data.frame(y=c(rep(2002,4), rep(2003,5)), + m=c(9:12, 1:5), + def=c(.74,.75,.76,.78,.80,.82,.85,.85,.87)) and the other dtf2 = data.frame(y=rep( c(2002,2003),20), m=c(trunc(runif(20,1,5)),trunc(runif(20,9,12))), inc=rnorm(40,mean=300,sd=150) ) What I want is to divide dtf2$inc by dtf1$def by the "levels" of y and m (inc is income and def is the deflator). Any help in vectori...

Dear R user, how can I update a data.frame adding new lines? I need to create a second data frame from a first one with only some of their entrys filtering the value of a specific column... How can I do this? thankyou very much in advance best regards Manuele PEsenti -- Manuele Pesenti manuele a inventati.org amicogodzilla a jabber.linux.it http://mpesenti.polito.it