Dario,
> On Dec 1, 2021, at 12:00 PM, Dario Strbenac <dstr7...@uni.sydney.edu.au>
> wrote:
>
> Good day,
>
> What I am misunderstanding about the inherits = TRUE option of mget? I expect
> the small example to work.
>
> f <- function(x, .iteration = i) g()
> g <- function() mget(".iteration", inherits = TRUE)
> f(10, 1)
> Error: value for ‘.iteration’ not found
>
That has nothing to do with inherits and is expected - it's identical to
> f <- function(x, .iteration = i) g()
> g <- function() .iteration
> f(10, 1)
Error in g() : object '.iteration' not found
Please note that R is lexically scoped and you defined g in the global
environment so it has no way of seeing inside f. This would work:
> f <- function(x, .iteration = i) {
+ g <- function() .iteration
+ g()
+ }
> f(10, 1)
[1] 1
since then the environment of f is the parent env of g.
If you want dynamic scoping (not what R uses!) you can use dynGet():
> f <- function(x, .iteration = i) g()
> g <- function() dynGet(".iteration")
> f(10,1)
[1] 1
but since that is non-standard the docs warn:
‘dynGet()’ is somewhat experimental and to be used _inside_
another function. It looks for an object in the callers, i.e.,
the ‘sys.frame()’s of the function. Use with caution.
Cheers,
Simon
> --------------------------------------
> Dario Strbenac
> University of Sydney
> Camperdown NSW 2050
> Australia
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