This last solution is what I was looking for, I was trying to avoid loops. 
Thanks!

-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On 
Behalf Of Rainer Schuermann
Sent: 5. oktober 2011 18:29
To: r-help@r-project.org
Subject: Re: [R] Populate a matrix

m <- matrix( rep( y, length( x ) ), length( y ), length( x ) )


On Wednesday 05 October 2011 18:11:18 fernando.cabr...@nordea.com wrote:
> Hi guys
> 
> I have vectors x <- c(1,2,3,4) and y <- c(4,3,9) and would like to generate a 
> matrix which has 3 rows (length(y)) and 4 
columns (length(x)), and each row is the corresponding y element repeated 
length(x) times.
> 
> 4,4,4,4
> 3,3,3,3
> 9,9,9,9
> 
> Thanks.
> 
> Fernando Álvarez
> 
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