[R] how modify object in parent.env

[McGehee, Robert]

This isn't an environment problem. Assigning something to a get call
doesn't make any sense. Use assign.

> a <- 5
> get("a") <- 10
Error: couldn't find function "get<-"

And from the ?assign help page, you can pick what environment you want
to make the assignment. Just pick the parent environment.


-----Original Message-----
From: Vadim Ogranovich [mailto:vograno at evafunds.com] 
Sent: Tuesday, March 08, 2005 6:36 PM
To: r-help at stat.math.ethz.ch
Subject: [R] how modify object in parent.env


Hi,
 
Is it possible to modify an object in the parent.env (as opposed to
re-bind)? Here is what I tried:
 
> x = 1:3
# try to modify the first element of x from within a new environment
> local(get("x", parent.env(environment()))[1] <- NA)
Error in eval(expr, envir, enclos) : Target of assignment expands to
non-language object

# On the other hand retrieval works just fine
> local(get("x", parent.env(environment()))[1])
[1] 1

Thanks,
Vadim

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