[R] How to convert a list to a matrix

[Romain Francois]

Hello,

try the following :

> l <- list(NULL)
> l[[1]] <- 1:2
> l[[2]] <- 2:3
> l[[3]] <- 4:5
> l
[[1]]
[1] 1 2

[[2]]
[1] 2 3

[[3]]
[1] 4 5

> matrix(unlist(l),ncol=2)
     [,1] [,2]
[1,]    1    3
[2,]    2    4
[3,]    2    5


Is that what you want ?

Romain
Le 03.02.2005 16:08, michael watson (IAH-C) a écrit :

>Hi
>
>Sorry to ask such a basic question.  I have a list, each element of
>which is a vector of two values.  What I actually want is a matrix with
>two columns, and one row per element of the list.  Obviously I have
>tried as.matrix(), and as.vector() but I didn't expect the latter to
>work.
>
>I feel so lame asking this.  Any suggestions?
>
>Mick
>
>  
>

-- 
Romain FRANCOIS : francoisromain at free.fr
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