A where() functions that does what exists() does but return the environment when object lives?

On Sat, Oct 10, 2015 at 1:24 AM, Uwe Ligges
<ligges at statistik.tu-dortmund.de> wrote:

I'd start looking at getAnywhere().

Thanks Uwe, that does indeed provides "where" information.
Unfortunately, I don't see how it will allow me to search environments
similarly/in the same order as exists/get(..., envir, inherits=TRUE)
does it.  getAnywhere() will search everything in any order.  It's a
start though.

Cheers,

Henrik

Best,
Uwe


On 10.10.2015 01:18, Henrik Bengtsson wrote:

Hi,

exists("foo", inherits=TRUE) check whether an object named "foo"
exists, and get("foo", inherits=TRUE) retrieves it.  I'm looking for a
similar function to exists() that returns the environment where the
object "foo" exists, iff at all.  If not found, NULL is returned.
Does that exist?

EXAMPLE #1:

sample2 <- base::sample
env <- where("sample2", inherits=TRUE)
env

<environment: R_GlobalEnv>

Note the difference to:

obj <- get("sample2", inherits=TRUE)
environment(obj)

<environment: namespace:base>


EXAMPLE #2:

a <- 1
foo <- function() { b <- 2; list(a=where("a", inherits=TRUE),
b=where("b", inherits=TRUE)) }
foo()

$a
<environment: R_GlobalEnv>
$b
<environment: 0x000000000b7d2798>

foo()

$a
<environment: R_GlobalEnv>
$b
<environment: 0x000000000b7d23e0>


I do understand that I can implement such a function myself, but I
prefer not to.

Thanks,

Henrik