How to detect the maximums of a signal, Cómo detectar los maximos de una señal

Hi!! I need a code which detects all de maximums of a signal. This signal has clear peaks, so I would like to know their position.

I have tried this, but the result is not the expected one:

function index_max = PRUEBAMAXIMO(x)

 [lloc, tamany] = size(x); 
 index_max = zeros(1,2);

   for(i=0:tamany-2) 
     if(x(i+1)>x(i+2)) 
         index_max(1) = i;
                   i = tamany-1;
                end

         end

     for (s=index_max(1):tamany-3) 

         if(x(s+1) < x(s+2)) %si se da esto, esporque empieza la subida
       s_subida = s;
       for (k=s_subida:tamany-3) 
         if(x(s+1) > x(s+2)) 
                     index_max(2)=s;
             k = tamany -3; %//para salir del for
           s = tamany-3; %//para salir del for
                                 end

                       end
         end

     end

THANK YOU VERY MUCH IN ADVANCED % % end

Thank you very much

[Mahdi]

Have you looked into the findpeaks() function to see if it helps give you the solution that you want?