[R] call by reference

[Gabor Grothendieck]

You can do this:


   fb <- function(bS, env = parent.frame()) {
        bS <- deparse(substitute(bS))
        assign(bS, 3, env = env)
   }
   fb(bS)
   bS
   rm(bS)
  # or corresponding to your code
  fb(bS, env = .GlobalEnv)

Of course when typed in both give the same result since the global environment
is the parent frame.

Please use <- and = consistently and properly space your source code.

On 12/21/06, biter bilen <biterbilen at yahoo.com> wrote:
>
>
> a = 9
>    b = 8
>    print (a)
>    print (b)
>    fa<-function(bS, aV) {
>            aV <<- 3
>            assign(bS,3,env = .GlobalEnv)
>    }
>    fa("b", a)
>    print (a) #9
>    print (b) #3 #only this call is ok
>
>
>
> ----- Original Message ----
> From: Prof Brian Ripley <ripley at stats.ox.ac.uk>
> To: biter bilen <biterbilen at yahoo.com>
> Cc: r-help at stat.math.ethz.ch
> Sent: Wednesday, December 20, 2006 11:04:08 AM
> Subject: Re: [R] call by reference
>
> Can you tell us what you want to do with 'pass/call by reference'?
>
> If you want an R function to alter its argument then it is possible
> (KalmanLike is an example), but it should only be possible via C code.
> And if you know enough to do that, you probably would not be asking (and
> definitely not be asking on R-help rather than R-devel).
>
> On Tue, 19 Dec 2006, biter bilen wrote:
>
> > Can anyone help me about pass by reference of arguments in R functions?
> >
> > I have read about .Alias in base package however it is defunct and there
> > is no replacement for it.
>
> That's not a fair summary of the help entry for .Alias.
>
> --
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
>
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