Re: [R] Dummy quesion about environment
Thank you Peter,
for the comprehensive explanation. The reason I asked Does 'search do it?' is
that as I can run
ls(env=environment(h))
I can run
ls(env=environment(package:methods))
or ls(package:methods)
which I can see by search.
I thought maybe what I see by search is all the environments under .GobalEnv
which I understan this is not what I see by search.
Thanks
Ron
Peter Dalgaard [EMAIL PROTECTED] 09/27/05 11:49 PM
Ron Ophir [EMAIL PROTECTED] 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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c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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Re: [R] Dummy quesion about environment
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$y
can I access y and x?
how can I see an environment tree? oes search does it?
Thanks,
Ron
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
--
Roger D. Peng
http://www.biostat.jhsph.edu/~rpeng/
__
R-help@stat.math.ethz.ch mailing list
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PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Dummy quesion about environment
Ron Ophir [EMAIL PROTECTED] writes:
Hi,
I'm trying to understand environment object in R.
I used the example:
f - function(x) {
y - 10
g - function(x) x + y
return(g)
}
h - f()
h(3)
then i saw that f return an environment
h
function(x) x + y
environment: 01B28570
but I coudn't access to x and y object in that environment:
I tried
get(x,env=h)
I tried
h$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
__
R-help@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
--
O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
__
R-help@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
Re: [R] Dummy quesion about environment
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@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
__
R-help@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
