Hi, I wonder how to write a function that remembers its state across its calls. For example, I would like to compute the average of the pass three values the function has seen
f(1) # NA f(2) # NA f(3) # 2 f(4) # 3 This would require f to keep track of the values it has seen. In other languages like c++ or java it is easy to do by having a member variable. I am not sure how to do similar things in R because the variables declared in functions are gone after the function exits. It is possible do a quick-dirty function by declaring a variable outside of f to keep track of what the function has seen. But then the logic of keeping tracking that variable is not encapsulated in f. It would be messy if I have lots of such functions. Thanks for any advice in advance. Jeff ______________________________________________ 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.
