[R] Get object name inside lapply

[Aashish Jain]

Why don't you simply use names(c) to get the names of all objects? If, for
your purposes, you still want the "names" function inside lapply, you can
use the following:
unlist(lapply(1:length(c), function(x) names(c[x])))
This will produce exactly same output as names(c) would. When you use
lapply(c, names) then it basically does this: names(c[[1]]) for first
member of the list, and that results to NULL. However, names(c[1]) gives
you "a".

Hope that helps.

On Thu, Feb 25, 2016 at 3:27 PM, Mohammad Tanvir Ahamed via R-help <
r-help at r-project.org> wrote:

> Hello,
>
> I want to get object name of a list inside lapply
>
> > c<-list(a=seq(1:5),b=seq(10:20))
> > lapply(c,names)
> $a
> NULL
>
> $b
> NULL
>
> Why NULL ?
>
> but i am expecting the names of object . Any help will be appreciated .
>
> I want to grab the names of object inside lapply for further process.
>
> Thanks .
>
>
> Tanvir Ahamed
> Göteborg, Sweden  |  mashranga at yahoo.com
>
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