[R] what's the meaning of these in R-lang?

[ronggui]

Thanks very much.

>ronggui <042045003 at fudan.edu.cn> writes:
>
>> In this case the environment contains the variables local to the
>> function, and its enclosure is the environment of the enclosing
>> function.(R-lang:p11)
>
>Page number are of dubious value for documents in multiple formats. It
>is page 5 in the PDF version on CRAN!
>
>> 
>> I want to know if the "enclosing function" means the closure of the
>> function? for example ,if I call function mean(),and the create an
>> environment,say e1,then the enclosure of e1 is the namespace of base
>> package? Right?
>
>No. A closure of a function is the function plus its environment. 
>
>For "enclosing function", consider
>
>f <- function() {
>        print(environment())
>        hello <- "Hi, babe!"
>        g <- function() print(hello)
>        g
>}
>myfun <- f() 
>myfun()
>environment(myfun)
>
>
>The enclosing function of g, and hence of myfun, is f. The evaluation
>environment of g has the evaluation environment of f as its enclosure. 
I think I get your point.

I would like to express what I think using the folloing code:
> debug(mean)
> mean(1:10)
debugging in: mean(1:10)
debug: UseMethod("mean")
Browse[1]> environment()
<environment: 0236EDA0>  # the evaluation environment.
Browse[1]> parent.env(environment()) 
<environment: namespace:base> # the enclosure of the evaluation environment.
Browse[1]> 
exiting from: mean(1:10)
[1] 5.5
> environment(mean)
<environment: namespace:base> # the environment of mean.

So what "# the enclosure of the evaluation environment." is always the same as "# the environment of function (here is mean)" .

Am I wrong again?


Regards!

>(The text is arguably imprecise: "evaluation environment of the
>enclosing function call" would be better, especially since
>environment(f) is something different.)

Yes,It's easier to understand by "evaluation environment of the
enclosing function call" 


>
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>   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
>  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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2005-11-24

------
Deparment of Sociology
Fudan University

My new mail addres is ronggui.huang at gmail.com
Blog:http://sociology.yculblog.com