access sublists by a variable

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
I can't remember if this is a FAQ but it is certainly discussed on the  
page you would ge with

?"$"

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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access sublists by a variable

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