Thanks for the replies Sorry for being unclear.
I am asking if there is a way to process a vector in a way that uses references to other elements of the same vector. And doing this without a for-loop. Here is a running code: <code> complexFn <- function(a,b){ c <- (a+b)/2 return(c) } x <- 1:10 y <- rep(NA, length(x)) for (i in 1:length(x)){ if(i>1){ y[i] = complexFn(x[i-1], x[i]) } } print(y) </code> And here is another attempt without the for-loop. <code> x <- 1:10 x1 <- c(NA, x) length(x1)<-length(x) y<-mapply(complexFn,x,x1) print(c(y)) </code> If someone could tell me the normal/elegant/effective/R way of doing this kind of vector processing, that would highly appreciated. best, gabor ______________________________________________ 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.