%   
% Written by:
% -- 
% John L. Weatherwax                2006-08-28
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

tmp = [ 1000, 500; 150, 100; 100, 200 ];
A   = 1./tmp; 

% Compute the Left Pseudoinverse:
% 
ALPI = (A' * A) \ A'; 
y = [ 0.5; 2.4; 2 ];

% and then x based on this: 
%
ALPI * y 

% vs. the direct option: 
%
[ -3000, 600; 2000, -300 ] * [ 0.5; 2.4 ]