[R] Extracting data from a list of matrices

[Henrique Dallazuanna]

Try this:

lapply(l, '[', 1, 1)


On Thu, Jan 14, 2010 at 2:22 PM, Hubert Colt <hubert.colt at gmail.com> wrote:
> Hi,
>
> Apologies in advance for the basic nature of my question. I am still very
> much a rookie when it comes to R. Having googled it, checked Nabble and
> trial/error to the best of my ability, I have yet to find an easy solution.
>
> I am currently working with a list of 5x5 matrices, and want to extract a
> list consisting of the first number of each matrix.
>
> In other words I want to go from:
>
> [[1]]
>              [,1]          [,2]          [,3]          [,4]          [,5]
> [1,]             a             X             X             X             X
> [2,]             X             X             X             X             X
> [3,]             X             X             X             X             X
> [4,]             X             X             X             X             X
> [5,]             X             X             X             X             X
>
> [[2]]
>              [,1]          [,2]          [,3]          [,4]          [,5]
> [1,]             b             X             X             X             X
> [2,]             X             X             X             X             X
> [3,]             X             X             X             X             X
> [4,]             X             X             X             X             X
> [5,]             X             X             X             X             X
>
> etc.
>
> to a new list:
>
>      [,1]
> [[1]]    a
> [[2]]    b
>
> etc.
>
> Any help will be greatly appreciated.
>
> -Hubert
>
>        [[alternative HTML version deleted]]
>
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>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O