Whenever you use a recursion (that cannot be expressed otherwise), you always need a (for) loop. Apply and the like do not allow to use the intermediary results (i.e. a[i-1] to calculate a[i]).
So: no, it cannot be avoided in your case, I guess. Nick Sabbe -- ping: nick.sa...@ugent.be link: http://biomath.ugent.be wink: A1.056, Coupure Links 653, 9000 Gent ring: 09/264.59.36 -- Do Not Disapprove -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of PLucas Sent: maandag 8 november 2010 10:26 To: r-help@r-project.org Subject: [R] How to eliminate this for loop ? Hi, I would like to create a list recursively and eliminate my for loop : a<-c() a[1] <- 1; # initial value for(i in 2:N) { a[i]<-a[i-1]*b - c[i-1] # b is a value, c is another vector } Is it possible ? Thanks -- View this message in context: http://r.789695.n4.nabble.com/How-to-eliminate-this-for-loop-tp3031667p30316 67.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.