Ken-JP wrote:
set.seed(1) x <- runif(100) # I want to calculate y such that: # # 1. if x>0.75, y <- 1 # 2. else if x<0.25, y <- -1 # 3. else if y_prev==1 && x<0.5, y <- 0 # 4. else if y_prev==-1 && x>0.5, y <- 0 # 5. else y <- y_prev # # 1. and 2. are directly doable without looping. # # How do I do 3.-5. without looping? The problem is, I need to run this algorithm over gigs of data, so I # need to avoid looping, if at all possible... # # - Ken
If y_prev is meant to be from a former iteration of a loop, you probably can't get rid of it. Original working code might have helped to udnertsand your problem better. Anyway, perhaps you can imnprove your loop in other ways, but again, we'd need to see at least some code ....
Uwe Ligges ______________________________________________ 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.
