% 
% Written by:
% -- 
% John L. Weatherwax                2006-09-03
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

clc; 

n = 1200; 
for jay = 1:4
  if( jay > 1 ) 
    oldtime = time; 
  end
  A = randn(n); 
  x = randn(n,1); 
  t = cputime;
  b = A*x; 
  matrixsize = n 
  time = cputime - t
  if( jay > 1 ) 
    ratio = time/oldtime
  end
  n = 2*n;
end