% OBJECTIVE FUNCTION
f = @(x) 0.26*(x(:,1).^2 +  x(:,2).^2 ) - 0.48*x(:,1).*x(:,2)

% OPTIMIZATION SETTINGS
o = struct	% initializing struct
o.lb = -5	% lower bounds
o.ub = 5	% upper bounds

% GRAPHIC REPRESENTATION
[x,y] = meshgrid(o.lb:0.5:o.ub)
surf(x,y,f([x(:),y(:)]))

% OPTIMIZATION 
rng(0)	% for tractability 
x0 = [4,5]	% initial guess 
[xmin,fmin,info] = fminsearch(f,x0,o)	% running minimization  

% ANIMATION
% Uncomment the following code to generate animation % 
% rng(0)
% x0 = [4,5]
% [~,~,info] = fminsearch(f,x0,o)
% info.sol = [0 0 0]	% solution 
% info.animate = true	% plot animation 
% info.animfreq = 5	% frame frequency 
% optimview('fminsearch',info)