Hi Thanks again. I hope not to waste to much of your time.
I delete some lines of your answer > Each time myfun is run a new environment is created to hold > its local variables. The parent of that environment is e in > this example by construction. So e and the environment that > is temporarily created to hold myfun's variables are distinct. This means that the enviroment is duplicated, ie it is present twince in memory? I must keep some big variables and it will be a waste of memory; moreover if I update a value it will be lost. > > If I can use inside myfun the variable as e$dat (without changing the > > enviroment (no environment(myfun) <- e statement)) than it will be ok. > > Yes you can. You can either make sure that e is visible to myfun > via normal scoping rules or pass it explicitly: > > e <- new.env() > e$dat <- 1:3 > myfun <- function(x) sum(x + e$dat) > myfun(10) > Hit!!! It solves the problem. A small drawback is that I need to modify the name of each occurrence of the variable. > # or passing e explicitly > > myfun2 <- function(x, e) sum(x + e$dat) > myfun2(10, e) > Any overhead in passing the environment? Is it a pointer? Sergio ______________________________________________ [email protected] 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.
