% 
% Written by:
% -- 
% John L. Weatherwax                2006-09-08
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

clc; 

A = [ 8 -4 0 ; -4 8 -4; 0 -4 8 ];
det(A)
b = [ 1 2 3 ].';
x = A\b