4 messages · Ron Ophir, Roger D. Peng, Peter Dalgaard +1 more
Hi,
I'm trying to understand environment object in R.
I used the example:
f <- function(x) {
y <- 10
g <- function(x) x + y
return(g)
}
h <- f()
h(3)
then i saw that f return an environment
h
function(x) x + y
<environment: 01B28570>
but I coudn't access to x and y object in that environment:
I tried
get("x",env=h)
I tried
h$y
can I access y and x?
how can I see an environment tree? oes search does it?
Thanks,
Ron
Try 'get("x", env = environment(h))'
-roger
Hi,
I'm trying to understand environment object in R.
I used the example:
f <- function(x) {
y <- 10
g <- function(x) x + y
return(g)
}
h <- f()
h(3)
then i saw that f return an environment
h
function(x) x + y
<environment: 01B28570>
but I coudn't access to x and y object in that environment:
I tried
get("x",env=h)
I tried
h$y
can I access y and x?
how can I see an environment tree? oes search does it?
Thanks,
Ron
______________________________________________ R-help at stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Roger D. Peng http://www.biostat.jhsph.edu/~rpeng/
"Ron Ophir" <ron.ophir at weizmann.ac.il> writes:
Hi,
I'm trying to understand environment object in R.
I used the example:
f <- function(x) {
y <- 10
g <- function(x) x + y
return(g)
}
h <- f()
h(3)
then i saw that f return an environment
h
function(x) x + y
<environment: 01B28570>
but I coudn't access to x and y object in that environment:
I tried
get("x",env=h)
I tried
h$y
can I access y and x?
Well, there are special issues with x above, but the basic thing is to take environment(h). Notice that h _is_ a function that _has_ an associated environment.
get("y",env=environment(h))
[1] 10 As I said, x is stranger, which is because you used f() in the call:
get("x",env=environment(h))
str(get("x",env=environment(h)))
symbol
a <- get("x",env=environment(h))
missing(a)
[1] TRUE
evalq(x,environment(h))
Error in eval(expr, envir, enclos) : argument "x" is missing, with no default
evalq(missing(x),environment(h))
[1] TRUE You'll get the point if you look long and hard enough...
how can I see an environment tree?
You can't. You can see the parent of an environment, the grandparent, etc., but there is no way to see which children a given environment has.
oes search does it?
Huh?
Thanks, Ron
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O__ ---- Peter Dalgaard ??ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
Hej, but in your function you add x and y to 10 and 3, so your values are merged to one value available in g variable. And now you want to see what was your y and your x? I guess I do not get the idea of your question. Well, then you could return y and x as well as g. Greetz n god luck. Roger D. Peng schrieb:
Try 'get("x", env = environment(h))'
-roger
Ron Ophir wrote:
Hi,
I'm trying to understand environment object in R.
I used the example:
f <- function(x) {
y <- 10
g <- function(x) x + y
return(g)
}
h <- f()
h(3)
then i saw that f return an environment
h
function(x) x + y
<environment: 01B28570>
but I coudn't access to x and y object in that environment:
I tried
get("x",env=h)
I tried
h$y
can I access y and x?
how can I see an environment tree? oes search does it?
Thanks,
Ron
______________________________________________ R-help at stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html