[R] discovery (was: data.frame to character)

[Achim Zeileis]

On Fri, 10 Jun 2005 11:59:07 -0500 Robert Citek wrote:

> How can one discover or list all available built-in objects?

Depends what you mean with `built-in'...
 
> On Jun 10, 2005, at 7:23 AM, Muhammad Subianto wrote:
> >> L3 <- LETTERS[1:3]
> >>  L10 <- LETTERS[1:10]
> 
> LETTERS is apparently a built-in character vector.  ls() and objects 
> () only lists the ones I've created. 

More precisely, it lists the objects in the global environment.

> Is there a function that lists  all available built-in objects?

R> search()

will show you the search path and in particular all packages that are
currently attached. Using

R> ls("package:base")

you could list all objects in the base packages which includes LETTERS.

> For example, "pi" is another built-in, but "e" is not. 

But "exp" is. So 

R> exp(1)

will give you "e".
Z

> A means to  
> list them would be nice.
> 
> Regards,
> - Robert
> 
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