Try:

matrix(unlist(a), ncol=2, byrow=T)

--Mark Lamias




________________________________
 From: Sam Steingold <sds@gnu.org>
To: r-help@r-project.org 
Sent: Tuesday, December 4, 2012 3:09 PM
Subject: [R] list to matrix?

How do I convert a list to a matrix?

--8<---------------cut here---------------start------------->8---
list(c(50000, 101), c(1e+05, 46), c(150000, 31), c(2e+05, 17), 
    c(250000, 19), c(3e+05, 11), c(350000, 12), c(4e+05, 25), 
    c(450000, 19), c(5e+05, 16))
as.matrix(a)
      [,1]    
[1,] Numeric,2
[2,] Numeric,2
[3,] Numeric,2
[4,] Numeric,2
[5,] Numeric,2
[6,] Numeric,2
[7,] Numeric,2
[8,] Numeric,2
[9,] Numeric,2
--8<---------------cut here---------------end--------------->8---

thanks!

-- 
Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000
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