R help - Mar 2008 - Dynamic string as element name in a list

Dear all,

I have a piece of code along the lines of

f <- function(x) {
 clipname <- "LK"  # but is in real determined based on info in
data.frame x
 # other manipulations
 return( list(clipname=list(....)))
}

My intention is to do

out <- f(dat)

and then (in this example) having/getting

out$LK

which is a list in itself.


Of course, it doesn't work like this, but having tried all kinds of
combinations of eval(), parse(), substitute(), and friends I was
unable to get the contents of clipname as the element name of the list
that I return in f().

Is this possible to do so at all and if so, what am I missing?


Kind regards,
Paul Lemmens

Try this:

foo <- function(x)
{
clipname <- "LK"
out <- list()
out[[clipname]] <- rnorm(5)
return(out)
}

On 27/03/2008, Paul Lemmens <paul.lemmens at gmail.com>
wrote:
> Dear all,
>
>  I have a piece of code along the lines of
>
>  f <- function(x) {
>   clipname <- "LK"  # but is in real determined based on info
in data.frame x
>   # other manipulations
>   return( list(clipname=list(....)))
>  }
>
>  My intention is to do
>
>  out <- f(dat)
>
>  and then (in this example) having/getting
>
>  out$LK
>
>  which is a list in itself.
>
>
>  Of course, it doesn't work like this, but having tried all kinds of
>  combinations of eval(), parse(), substitute(), and friends I was
>  unable to get the contents of clipname as the element name of the list
>  that I return in f().
>
>  Is this possible to do so at all and if so, what am I missing?
>
>
>  Kind regards,
>  Paul Lemmens
>
>  ______________________________________________
>  R-help at r-project.org mailing list
>  https://stat.ethz.ch/mailman/listinfo/r-help
>  PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
>  and provide commented, minimal, self-contained, reproducible code.
>

-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O