[R] Query on save.image()

[Joshua Wiley]

Hi,

I do not believe you can use the save.image() function in this case.
save.image() is a wrapper for save() with defaults for the global
environment (your workspace).  Try this instead, I believe it does
what you are after:

myfun <- function(x) {
y <- 5 * x + x^2
save(list = ls(envir = environment(), all.names = TRUE),
     file = "myfile.RData", envir = environment())
}

Notice that for both save() and ls() I used the environment() function
to grab the current environment.  This should mean that even if "y"
was defined globally, it would save a copy of the version inside your
function.

Hope that helps,

Josh


On Thu, Oct 14, 2010 at 9:25 AM, Megh Dal <megh700004 at yahoo.com> wrote:
> Can anyone please tell me how can use save.image() function if it is placed within a function (i.e. some level up from the base level environment)? Here I experimented with following codes:
>
>
> #rm(list=ls())
> fn <- function() {
>    x <- rnorm(5)
>    save.image("f:/dat.RData")
>  }
> fn()
>
> However I see that, the object fn() is actually stored in dat.RData file, not that "x". I have gone through the help page and saw there is some argument named "envir"
> My question is if I need to supply some value against that argument, then what should be the name of the required environment?
>
> Additionally is there any option to see the hierarchy of different environments at my current R session?
>
> Thanks,
>
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>



-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/