Re: [R] a question about scoping functions
I wrote a function a while back that does something like "attaching" R
source files. The code in the R file is attached in the second position
on the search list. I actually don't use it much but you may find it
useful.
sattach <- function(filename) {
if(!is.character(filename))
stop(sQuote("filename"), " must be character string")
e <- new.env()
eval(parse(filename), envir = e)
func.list <- lapply(ls(e), get, envir = e)
names(func.list) <- ls(e)
outobj <- make.names(basename(filename))
assign(outobj, func.list)
cmd <- paste("attach(", outobj, ")", sep = "")
eval(parse(text = cmd))
}
-roger
Rajarshi Guha wrote:
Hi,
I've written some helper functions which are used by another function
(called func()). When func() is sourced I dont want the helper function
to be seen in the global namespace (as shown by ls()).
Currently what I have done is:
func <- function() {
helper1 <- function() {
...
}
helper2 <- function() {
...
}
# some code
}
Is there anyway to take the functions helper1 and helper2 outside func
(but in the same file) yet keep them from showing up in the global
namespace when the source file for func() is loaded?
A related question is: say I move helper1 and helper2 to a file called
helper.R
When I want to use the helper functions inside func() I can do
source('helper.R') - but that would place them in the global namespace.
Is it possible to source some file within a func() such that the sourced
functions will be local to func()?
Thanks,
---
Rajarshi Guha <[EMAIL PROTECTED]>
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
---
Did you hear that two rabbits escaped from the zoo and so far they have
only recaptured 116 of them?
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Re: [R] a question about scoping functions
On Fri, 26 Mar 2004 21:28:08 -0500, Rajarshi Guha <[EMAIL PROTECTED]>
wrote :
>Is there anyway to take the functions helper1 and helper2 outside func
>(but in the same file) yet keep them from showing up in the global
>namespace when the source file for func() is loaded?
A simpler (but slightly less effective way) than what Andy suggested
is to name the helper functions with names starting with a dot. By
default ls() won't show objects like that (just like ls in Unix).
E.g.
> visible <- 1
> .notvisible <- 2
> ls()
[1] "visible"
>A related question is: say I move helper1 and helper2 to a file called
>helper.R
>
>When I want to use the helper functions inside func() I can do
>source('helper.R') - but that would place them in the global namespace.
>Is it possible to source some file within a func() such that the sourced
>functions will be local to func()?
Putting the line
source('helper.R', local = TRUE)
in func() will do that.
Duncan
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RE: [R] a question about scoping functions
Here's one possible alternative:
- Write the helper functions outside of func().
- source() the file containing all the functions.
- save(helper1, helper2, file="helperfuns.rda")
- rm(helper1, helper2)
- attach("helperfuns.rda")
Eventually you may want to put things into a package...
HTH,
Andy
> From: Rajarshi Guha
>
> Hi,
> I've written some helper functions which are used by another function
> (called func()). When func() is sourced I dont want the
> helper function
> to be seen in the global namespace (as shown by ls()).
>
> Currently what I have done is:
>
> func <- function() {
> helper1 <- function() {
> ...
> }
> helper2 <- function() {
> ...
> }
> # some code
> }
>
> Is there anyway to take the functions helper1 and helper2 outside func
> (but in the same file) yet keep them from showing up in the global
> namespace when the source file for func() is loaded?
>
> A related question is: say I move helper1 and helper2 to a file called
> helper.R
>
> When I want to use the helper functions inside func() I can do
> source('helper.R') - but that would place them in the global
> namespace.
> Is it possible to source some file within a func() such that
> the sourced
> functions will be local to func()?
>
> Thanks,
> ---
> Rajarshi Guha <[EMAIL PROTECTED]>
> GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
> ---
> Did you hear that two rabbits escaped from the zoo and so far
> they have
> only recaptured 116 of them?
>
> __
> [EMAIL PROTECTED] mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>
>
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[R] a question about scoping functions
Hi,
I've written some helper functions which are used by another function
(called func()). When func() is sourced I dont want the helper function
to be seen in the global namespace (as shown by ls()).
Currently what I have done is:
func <- function() {
helper1 <- function() {
...
}
helper2 <- function() {
...
}
# some code
}
Is there anyway to take the functions helper1 and helper2 outside func
(but in the same file) yet keep them from showing up in the global
namespace when the source file for func() is loaded?
A related question is: say I move helper1 and helper2 to a file called
helper.R
When I want to use the helper functions inside func() I can do
source('helper.R') - but that would place them in the global namespace.
Is it possible to source some file within a func() such that the sourced
functions will be local to func()?
Thanks,
---
Rajarshi Guha <[EMAIL PROTECTED]>
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
---
Did you hear that two rabbits escaped from the zoo and so far they have
only recaptured 116 of them?
__
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