[R] access list component names with lapply

[Gabor Grothendieck]

Try this:

lapply(names(mylist), function(nm) c(nm, mylist[[nm]]))

On 3/29/06, Thomas Girke <thomas.girke at ucr.edu> wrote:
> I have a question regarding accessing the names of list
> components when applying a function with lapply.
>
> Here is an example that demonstrates what I'd like to do.
>
> I have a list like this one:
>
>        mylist <- list(a=letters[1:10], b=letters[10:1], c=letters[1:3])
>
> Now I would like to append the names of the list components to their
> corresponding vectors with the c() function. I thought this could
> be done like in the following command, but it doesn't:
>
>        lapply(mylist, function(x) { c(names(x), x)  } )
>
> I know how to do this in a for loop, but lapply runs so much faster over
> large lists.
>
> Any help on this simple problem will be highly appreciated.
>
> Thomas
>
>
> --
> Thomas Girke
> 1008 Noel T. Keen Hall
> University of California
> Riverside, CA 92521
>
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