[R] Assignment of structures on a given environment

Rita Ribeiro rita at liacc.up.pt
Tue Oct 16 16:02:55 CEST 2001


In order to avoid deep copies by passing large arguments to functions or
returning values, I'm trying to do the assignment of variables in a
given environment. The problem is when I try to assign a structure: a
list for example.

If I have:
    ind <- c("a","b")

my idea is doing something like

    l <- alist()
    l[ind] <- as.list(c(20,40))

 in a given environment.

    ref <- new.env()

    If I do

    it creates me a new variable in the ref environment  named "l$a"

    So,  I did:

    eval(l <- alist(), env=ref)

    but this creates the l list both on the current and on the ref

    The alternative solution that I found out was:


    and then

        evalq(ind <-c("a","b"), env=ref)
        evalq(l[ind] <- as.list(c(20,40)), env=ref)

I would like to know if there is another possible solution, instead of
doing these 'evalqs' along the program code.



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