[R] Accessing the elements of a list

[Thibaut Jombart]

Shubha Vishwanath Karanth wrote:
> Hi R,
>
>  
>
> I wanted to know how do we access the elements of a list. In particular,
>
>  
>
> v=list(c(1,2,3,4,5),c(1,2,33,4,5),c(1,2,333,4,5),c(1,2,3333,4,5))
>
>  
>
> I want to access all the thirds items of the elements of the list. i.e.,
> I want to access the elements, 3,33,333,3333. This can be done through
> sapply as:
>
>  
>
> sapply(v,function(x) x[3])
>
>  
>
> But I need to access this without using 'sapply'. Like in a data frame,
> we do df[2,3] etc.... Any ideas?
>
>   
Hi,

not the most elegant, but this works:

cmd > unlist(as.data.frame(v)[3,])
   c.1..2..3..4..5.   c.1..2..33..4..5.  c.1..2..333..4..5. 
c.1..2..3333..4..5.
                  3                  33                 
333                3333

Cheers,

Thibaut.

-- 
######################################
Thibaut JOMBART
CNRS UMR 5558 - Laboratoire de Biométrie et Biologie Evolutive
Universite Lyon 1
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69622 Villeurbanne Cedex
Tél. : 04.72.43.29.35
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jombart at biomserv.univ-lyon1.fr
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