Okay, I see, there is no really "easy" way (I was wondering whether I can set
an environment as default for new created variables). Is there any difference
if I call
myenv$myvar <- 10
or
assign("myvar",10, env=myenv)
?
Antje
Douglas Bates schrieb:
On Tue, Aug 26, 2008 at 6:07 AM, Henrique Dallazuanna <[EMAIL PROTECTED]> wrote:
I think you need assign, see ?assign for more details.
On Tue, Aug 26, 2008 at 6:02 AM, Antje <[EMAIL PROTECTED]> wrote:
Hi there,
I try to understand the usage of environments but I'm not sure if I get it.
I wrote a test script like this:
testenv <- new.env(environment())
myfun <- function(x) {
print(testvar)
testenv$testvar_2 <- 20
}
environment(myfun) <- testenv
testenv$testvar <- 10
As Henrique said, the canonical way of assigning a value within an
environment is the "assign". A more obscure, but also more effective,
approach is evalq which quotes an expression then evaluates it in the
given environment. For example
env <- new.env()
evalq({aa <- 1:3; bb <- LETTERS[1:9]; cc <- list(A = aa, B = bb)}, env)
objects(env)
[1] "aa" "bb" "cc"
env$aa
[1] 1 2 3
myfun("hello")
ls(envir = testenv)
Now, I was wondering if there is any way to create new variables in my
environment without this "testenv$...". I know that I can access it that way
if I do an attach(testenv) before, but that does not help when creating new
ones...
Do I completely misunderstand the concept?
I'm just looking for an elegant way to access objects of a graphical
userinterface from each handler-function and so on. And I thought it might
be good to pack them into an environment...
Antje
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
