[R] function environment

[Gabor Grothendieck]

Try this:

attach(as.list(ENV))
search()  # shows it on the path

A function's environment refers to where variables in the function
are looked for if they can't find the variable in the function itself.
The environment in which a function itself is located is entirely
different.

e.g.

a <- 1
e <- new.env()
e$a <- 2
e$fun <- function(x) x*x+a
environment(fun)
e$fun(10) # 101
fun2 <- function(x) x*x + a
environment(fun2) <- e
fun2(10)  # 102

fun is located in environment e but the environment of fun, i.e.
environment(fun), is the .GlobalEnv.

fun2 is located in the .GlobalEnv but the environment of fun2,
i.e. environment(fun2) is e.



On 6/2/06, Matthias Braeunig <mb.atelier at web.de> wrote:
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> Hi,
>
> how can I automatically access the functions that I loaded into a
> separate environment?
>
> > save(A,B,file="myfun.r")
> > load("myfun.r",envir=(ENV<-new.env()))
> > ls(ENV)
> [1] "A" "B"
>
> ?"[" turned up that I can access the functions via
>
> > ENV$A
> function ()
> {
> }
> > ENV$A()
> NULL
>
> Now, how can they be included in the search() path??
> attach() as for data.frames does not work...
>
> Furthermore, if I change a functions environment to ENV, why is it not
> listed with ls(ENV)?? Instead it still lives in .GlobalEnv
>
> > C<-function(){}
> > environment(C)<-ENV
> > ls(ENV)
> [1] "A" "B"
> > C
> function(){}
> <environment: 0x9cbbb58>
> > ENV
> <environment: 0x9cbbb58>
>
> Thanks folks!
> I enjoy reading and learning from r-help list!
>
> M
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