[R] how modify object in parent.env

[Vadim Ogranovich]

Assign() re-binds the value, not modifies it (the latter is what I
needed) 

> -----Original Message-----
> From: McGehee, Robert [mailto:Robert.McGehee at geodecapital.com] 
> Sent: Tuesday, March 08, 2005 3:48 PM
> To: Vadim Ogranovich; r-help at stat.math.ethz.ch
> Subject: RE: [R] how modify object in parent.env
> 
> 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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