[R] list syntax question: which subscript is which
jim holtman
jholtman at gmail.com
Wed Oct 15 04:01:36 CEST 2008
actually meant to say:
max(sapply(foo, function(x) max(x[,1])))
On Tue, Oct 14, 2008 at 5:49 PM, Carl Witthoft <carl at witthoft.com> wrote:
> Hi,
> Sorry to bother with something that should be simple, but I can't find it.
>
> Suppose I have a list, each element of which is a 2xN dataframe, where N
> could be different for each element.
> Is there some simple structure to let me examine all the elements of each
> element's first column? For example:
>
>>foo
> $first
> [,1] [,2]
> [1,] 1 4
> [2,] 2 5
> [3,] 3 6
>
> $second
> [,1] [,2]
> [1,] 1 6
> [2,] 2 8
> [3,] 3 6
> [4,] 4 8
>
> To find the maximum element in all first columns (say, to set the range of a
> plot where all first columns are x-data), I'd like the legal equivalent of
>
>>max(foo[[*]][,1])
> (where here "*" is a wildcard intended to span all elements of foo)
>
> Or do I have to use one of the apply() functions?
>
> thanks
> Carl
>
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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