function matlab7()
global count countmax

close all;

functions = {@easy,@difficult}; 
for i=1:length(functions) 

    u = functions{i}; 
    count = 0; countmax = 100000;
    xi = -2:.1:2;
    [X Y Z] = meshgrid(xi,xi,xi); 
    U = u(X,Y,Z);
    figure; slice(X,Y,Z,U,[-1.2,.8,2],[2],[-2])
    fprintf('\n Count %d : Global minimum = %14.7e',count,min(min(min(U))));
    
    count = 0; countmax = 200;
    [x,y,z] = minimumSearch(u);
    fprintf('\n ------------------------\n (x,y,z) = %14.7e %14.7e %14.7e  \n',x,y,z)
    fprintf('\n Count %d : Obtained value = %14.7e \n',count,u(x,y,z))

end
end

function u = easy(x,y,z)
global count countmax;
count = count+ prod(size(x));
if (count > countmax) 
    error('Too many evaluations : my poor guy !'); 
end
u = (x-0.1).^2 + (y - 0.4).^2 + (z - 0.3).^2;
end
       
function u = difficult(x,y,z)
global count countmax;
count = count+ prod(size(x));
if (count > countmax) 
    error('Too many evaluations : my poor guy !'); 
end
u = sin(3*y-x.^2+1)+7 *cos(2*y.^2-2*x)+ 4 *sin(3*y-z.^2+1) + 2* cos(2*y.^2-2*z);
end