Message-ID: <5E9F1520-621A-4827-9FF6-303D9B7DB150@comcast.net>
Date: 2011-11-16T16:57:16Z
From: David Winsemius
Subject: access sublists by a variable
In-Reply-To: <4EC3D3C9.5070004@allesjetzt.net>
On Nov 16, 2011, at 10:16 AM, Antje Gruner 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
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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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT