Here are a couple of ways: > tail(a, -2) - head(a, -2) [1] 2 5 -3 > c(ts(a) - lag(ts(a), -2)) [1] 2 5 -3
On Mon, Aug 11, 2008 at 11:26 AM, dott <[EMAIL PROTECTED]> wrote: > > Hi, > > I'd like to take difference for a sequence a between a_i and a_i-2, for > instance, > a<-c(2,3,4,8,1) > I need (2, 5, -3) as a result. If not using a for loop, can anyone help me? > Thanks a lot. > > Dot > -- > View this message in context: > http://www.nabble.com/R-help--how-to-take-difference-in-next-two-elements-tp18927968p18927968.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
