[R] Print list structure

[Martin Morgan]

Hi Antje,

I know you have a solution, but

> l <- list(list(L=1,list(L=2)))
> f <- function() { i=1; function(...) {cat("level", i, ":", ...); i<<-i+1 }}
> r=rapply(l, f(), "..."="\n")
level 1 : 1 
level 2 : 2 

lets you use R scoping rules and a relatively new addition to the
'apply' family of functions. It also points to a bit of awkwardness in
the signature for rapply (maybe it would have been more consistent
with rapply(X, FUN, ..., classes="ANY", etc)

Martin

Duncan Murdoch <murdoch at stats.uwo.ca> writes:

> On 11/5/2007 8:34 AM, Antje wrote:
>> Hello again,
>> 
>> I was wondering whether there is a command with which I can print the structure 
>> of a list, containing list of list of ...
>> If you have any hint let me know...
>
> str() can print the structure of any R object.
>
> Duncan Murdoch
>
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