fminsearch vector of results

Here's my model:

Given the model, my intention is to estimate γ having the values of C, and .

I tryed with the following code, but the program returns me only one value for γ while I need the vector containing every value produced in the loop.

How can I fix the code to get it?

j=1; %increment level. The loop will work for j>1 as well.
for i=1:j:steps;
fnc = @(gamma,C,Sum_I) C(i)./(1+gamma) - (gamma./(1+gamma)).*Sum_I(i);  % Model function
rn = @(gamma) norm(I - fnc(gamma,C,Sum_I)); % Residual norm
gamma0 = [15]; % Inizializzazione
[gamma, ResNorm] = fminsearch(rn, gamma0);  
end

Answer 1

[Walter Roberson]

steps = 5;
C = @cos;
Sum_I = @atan;
I = 42;


j=1; %increment level. The loop will work for j>1 as well.
for i=1:j:steps;
fnc = @(gamma,C,Sum_I) C(i)./(1+gamma) - (gamma./(1+gamma)).*Sum_I(i);  % Model function
rn = @(gamma) norm(I - fnc(gamma,C,Sum_I)); % Residual norm
gamma0 = [15]; % Inizializzazione
[gamma(i), ResNorm(i)] = fminsearch(rn, gamma0);  
end
gamma

gamma = 1×5

-0.9690 -0.9840 -0.9940 -0.9845 -0.9618

[MARCO FORTI]

Thanks