help optimization Simulated Annealing

Hey, i have this programme but he didn t work somone know why ?

function T=f(xe,ye)
T=sin(xe)*sin(ye)+0.1*xe;
end 
function w=g(xn,yn)
w=sin(xn)*sin(yn)+0.1*xn;
end 
 for xe= -4:4
       for ye= -4:4
    while (T>Tfinale && nb_iter< 5000) 
           xn=xe+ampli*rand;
           yn=ye+ampli*rand;
  
         if g(xn,yn) < f(xe,ye)    
            xe=xn;
            ye=yn;
         else 
            df= g(xn,yn)-f(xe,ye);
            p=exp(-df/T);
              if(p>rand) 
                 xe=xn;
                 ye=yn;
              end

         end
T=lamda*T;
nb_iter = nb_iter+1;
end  
     end 
   end

Answer 1

[Walter Roberson]

When you put a script and functions in the same file, the script must be the first thing in the file.

You do not initialize T or Tfinale or nb_iter or lamda

You appear to be accepting at random, as is done for simulated annealing, but you do not appear to be keeping track of the best position that was ever encountered.

[Image Analyst]

And of course (my pet peeve) there are no comments describing what the code is doing. That leads to unmaintainable code.