Re: list manipulation- an Easy method to do rbind within a

[John Fox <jfox@mcmaster.ca>]

Dear Steve,

At 11:07 PM 10/27/2002 +1000, Steve Su wrote:
> Lets
> suppose we have the following list:
>
> list(matrix(rnorm(6,3,2),ncol=2),matrix(rnorm(8,3,2),ncol=2),matrix(rnorm(12,3,2),ncol=2))
>
> [[1]]:
>         
> [,1]      [,2] 
> [1,] 3.276729
> -1.054961
> [2,] 6.143453 
> 2.661098
> [3,] 3.952712 
> 5.311158
>
> [[2]]:
>         
> [,1]     [,2] 
> [1,] 2.575617
> 2.513717
> [2,] 1.657351
> 2.806912
> [3,] 3.134966
> 3.357252
> [4,] 3.832333 7.657893
>  
> [[3]]:
>          
> [,1]       [,2] 
> [1,]  4.171555
> 1.67055950
> [2,] -1.763487
> 1.42753060
> [3,]  4.552255
> 2.78249251
> [4,] -3.206052
> 0.49597245
> [5,] -1.742525
> 4.01679075
> [6,]  2.486436
> 0.05678951
>  
>
> What is the most efficient way to combine these
> three elements into one matrix with two columns and 13 rows? Is there a
> simple and effective solution to this? My solution is quite complicated
> for the small problem at hand so I would appreciate any input
> J

Try
        lst <- list(matrix(rnorm(6,3,2),ncol=2), matrix(rnorm(8,3,2),ncol=2), matrix(rnorm(12,3,2),ncol=2))
        do.call("rbind", lst)

I hope that this helps,
 John

-----------------------------------------------------

John Fox

Department of Sociology

McMaster University

Hamilton, Ontario, Canada L8S 4M4

email: jfox@mcmaster.ca

phone: 905-525-9140x23604

web: www.socsci.mcmaster.ca/jfox

-----------------------------------------------------