% 
% Written by:
% -- 
% John L. Weatherwax                2007-07-01
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

clc; 
format rat; 

tab = [ 2, 3, 1, 0, 0, 7 ; 5, 2, 0, 1, 0, 3; -3, -4, 0, 0, 1, 0 ]
	 
tab(2,:) = tab(2,:)/2;
tab(1,:) = -3 * tab(2,:) + tab(1,:);
tab(3,:) =  4 * tab(2,:) + tab(3,:); 
tab