% OBJECTIVE FUNCTION
f = @(x,b) (b(1)*(x.^2+x*b(2)))./(x.^2+x*b(3)+b(4))

% PROBLEM SETUP
NIST_MGH09

% GRAPHIC REPRESENTATION
scatter(x,y)

% OPTIMIZATION 
rng(0)	% for tractability 
[b,info] = lsqcurvefit(f,ig1,x,y)	% running minimization 

% ANIMATION
% Uncomment the following code to generate animation % 
% rng(0)
% [~,info] = lsqcurvefit(f,ig1,x,y)
% info.plot = 'fit'
% info.animate = true	% plot animation 
% info.animfreq = 10	% frame frequency 
% optimview('lsqcurvefit',info) 