% 
% 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 = [ 2 -1 -1 0; -1 1.5 0 -.5; -1 0 1.7 -.2; 0 -.5 -.2 1.7 ]; 
b = [ 0 0 3 0 ].';
x = A\b