[R] Double centering matrix construction

[Gabor Grothendieck]

?sweep

Date:   Fri, 18 Jun 2004 16:32:58 -0500 (CDT) 
From:   Yong Wang <wang at galton.uchicago.edu>
To:   <r-help at stat.math.ethz.ch> 
Subject:   [R] Double centering matrix construction  

 
Dear All
do you know how to transform a matrix to a so-called double centering 
matrix such that sum(col) and sum(row) of the transformed matrix are all 0 
vector. 

thanks

regards
yong wang