R help - Dec 2006 - (no subject)

Hi,

Let us suppose I have a list 

x = list ()
x $ name1 = 1
x $ name2 = 'a'

in the work environment.

Let us suppose that in the body of a function I want to acces to a component of
x by
using its name as argument of that function. How can this by done? For instance,
I was
expecting

f = function ( name ) x $ name

to output 

1 ( that is, x $ name1 )

when I command f ( name1 ) or f ( 'name1' ), but that is not happening.
Does anyone knows
how I can fix f to give me x $ name, while the argument is still the name of the
component of x?

Thank you.

Just read some introductory R tutorial...
> x = list ()
> x $ name1 = 1
> x $ name2 = 'a'
> x
$name1
[1] 1

$name2
[1] "a"
> name <- "name1"
> x[name]
$name1
[1] 1
> x[[name]]
[1] 1
> name <- "name2"
> x[name]
$name2
[1] "a"
> x[[name]]
[1] "a"


Bye,
Scionforbai

Francisco J Molina wrote:
> Hi,
> 
> Let us suppose I have a list 
> 
> x = list ()
> x $ name1 = 1
> x $ name2 = 'a'
> 
> in the work environment.
> 
> Let us suppose that in the body of a function I want to acces to a
component of x by
> using its name as argument of that function. How can this by done? For
instance, I was
> expecting
> 
> f = function ( name ) x $ name
f <- function(name) x[[name]]
Please read the docs such as help("$").

Uwe Ligges

> to output 
> 
> 1 ( that is, x $ name1 )
> 
> when I command f ( name1 ) or f ( 'name1' ), but that is not
happening. Does anyone knows
> how I can fix f to give me x $ name, while the argument is still the name
of the
> component of x?
> 
> Thank you.
> 
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