[R] Plots spanning columns

[Jose Luis Aznarte M.]

    Hi! I want to plot three graphs (residuals, ACF and PACF of a 
model). Ideally I would use a c(2,2) disposition where the residuals 
plot would start at position 1,1 and span to position 1,2. Then I would 
plot the ACF in position 2,1 and the PACF in position 2,2. Maybe is 
clearer like this:

--------------------------
|                        |
|       residuals        |
|                        |
--------------------------
------------ -------------
|          | |           |
|    ACF   | |   PACF    |
|          | |           |
------------ -------------

Does anyone know if that is possible at all? Cheers!

-- 
--                                                      --
Jose Luis Aznarte M.       http://decsai.ugr.es/~jlaznarte
Department of Computer Science and Artificial Intelligence
Universidad de Granada           Tel. +34 - 958 - 24 04 67
GRANADA (Spain)                  Fax: +34 - 958 - 24 00 79