Help - Problem with fminsearch

2020 11 9
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Hi everyone,
I have three vectors that I calculated in MatLab with expression find previously.
Now I would create a function that maximize my utility function (U) and retourn me the values find analiticaly.
For this I writed this function:
function U = punto2(x, PC, p_a, p_m, p_s)
%Definiamo i parametri
omega_a = 0.33;
omega_m = 0.33;
omega_s = 0.33;
epsilon = 0.5;
cs_bar = 0;
ca_bar = 0;
cm_bar = 0;
% Dove x(1) = c_m and x(2)= c_s
U = - ( ((omega_a^(1/epsilon)) * ( ((PC/p_a) - ((p_m*x(1))/p_a) - ((p_s*x(2))/p_a)) + ca_bar )^((epsilon-1)/epsilon)...
+ (omega_m^(1/epsilon)) * (x(1) + cm_bar)^((epsilon-1)/epsilon)...
+ (omega_s^(1/epsilon)) * (x(2) + cs_bar)^((epsilon-1)/epsilon) )^(epsilon/(epsilon-1)) );
Where U is the function that i would maximize.
Now, when I call the function in my main script in this way:
z0 = [0.333 0.333];
max_U(t,:) = fminsearch(@(x) punto2(x, PC, p_a, p_m, p_s), z0);
MatLab retourn me different values except for the first.
Info: The function is recalled inside the for loop.
Some help?

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