R devel - Mar 2012 - Why is there no within.environment function?

If I want to assign some variables into an environment, it seems
natural to do something like

e <- new.env()
within(e,
    {
      x <- 1:5
      y <- runif(5)
    }
)

This throws an error, since within.environment doesn't exist.? I
realise I can work around it using

as.environment(within(as.list(e),
    {
      x <- 1:5
      y <- runif(5)
    }
))

Just wondering why I can't use within directly with environments.

--
4dpiecharts.com

On Wed, Mar 21, 2012 at 5:51 PM, Richard Cotton <richierocks at gmail.com>
wrote:
> If I want to assign some variables into an environment, it seems
> natural to do something like
>
> e <- new.env()
> within(e,
> ? ?{
> ? ? ?x <- 1:5
> ? ? ?y <- runif(5)
> ? ?}
> )
>
> This throws an error, since within.environment doesn't exist.? I
> realise I can work around it using
>
'with' already does that:

e <- new.env()
with(e, {
   x <- 1.5
   y <- runif(5)
})
ls(e) # lists x and y

Also since proto objects are environments this works:

library(proto)
p <- proto(x = 1.5, y = runif(5))
p$ls() # lists x and y

-- 
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com

Wouldn't within.environment be identical to with.environment?
  > e <- new.env()
  > with(e, { One <- 1 ; Two <- 2+2i ; Theee <- One + Two })
  > objects(e)
  [1] "One"   "Theee" "Two"
It might make the transition between lists and environments
simpler if within.environment  existed.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

> -----Original Message-----
> From: r-devel-bounces at r-project.org [mailto:r-devel-bounces at
r-project.org] On Behalf
> Of Richard Cotton
> Sent: Wednesday, March 21, 2012 2:51 PM
> To: r-devel at r-project.org
> Subject: [Rd] Why is there no within.environment function?
> 
> If I want to assign some variables into an environment, it seems
> natural to do something like
> 
> e <- new.env()
> within(e,
>     {
>       x <- 1:5
>       y <- runif(5)
>     }
> )
> 
> This throws an error, since within.environment doesn't exist.? I
> realise I can work around it using
> 
> as.environment(within(as.list(e),
>     {
>       x <- 1:5
>       y <- runif(5)
>     }
> ))
> 
> Just wondering why I can't use within directly with environments.
> 
> --
> 4dpiecharts.com
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel