[R] how do i use the get function to obtain an element from a list...
Tony Plate
tplate at acm.org
Tue Aug 21 22:38:06 CEST 2007
One simple way that I haven't seen mentioned yet is to do:
> get("a")$x
(which of course allows further variants such as get("a")$x[3:6] ...)
-- Tony Plate
Juan Manuel Barreneche wrote:
> my problem can be explained with the following example:
>
> x <- 1:12
> y <- 13:24
> a <- data.frame(x = x, y = y)
>
> ## if i write
> a$x
> ## it returns
> [1] 1 2 3 4 5 6 7 8 9 10 11 12
>
> ## but the function get doesn't recognize a$x. Instead it produces the
> following error:
> get("a$x")
> Error in get(x, envir, mode, inherits) : variable "a$x" was not found
>
> i intend to do it inside a loop, using a new object (and hence, a new
> name) for each iteration (i.e., instead of a$x, it would be a$1, a$2,
> a$3, and so on, for a million times).
>
> i would greatly appreciate it if someone could help me on this issue,
>
> thanks in advance,
>
> Juan Manuel Barreneche,
> Zoología de Vertebrados,
> Facultad de Ciencias,
> UDELAR, Uruguay.
>
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