[R] access sublists by a variable

[Dennis Murphy]

Hi:

Try dict[[a]] rather than dict$a, and read the section on lists in the
Introduction to R manual to learn how to properly index them.

HTH,
Dennis

On Wed, Nov 16, 2011 at 7:16 AM, Antje Gruner <ntj at allesjetzt.net> wrote:
> Dear list,
>
> I'd like to access the elements of a list within another list with the
> help of a variable.
>
> dict <- list(  "24" = c(1,2,3,6,12,24,48,72,96,120,144,168,720),
>          "168" = c(1,12,24,48,72,96,120,144,168,336,504,672),
>         "8760" = c(1,24,168,730,4380,8760)
>        )
>
> dict$"24" works fine, but
>
> a <- "24"
> dict$a
>
> returns  NULL
>
> Unfortunately dict[a] does not work for me, because I see no possibility
> to access the inner elements of list "24" in that case
> i.e. dict[a][1] returns the whole list and not the first element.
>
> What is the correct syntax to access those elements with the help of a
> variable?
> Thanks in advance
>
> Antje
>
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