Summation with Nested For Loop

Hi,

I am trying to perform summation using for loop, where I have to change two different variables, theta and theta_m. Thetha_m has to run for 5 iterations (values given) and Theta has to run for 19 iterations. However, at the end I am getting same numbers in whole array. I think I am doing something wrong at the end. Can someone please look at the equation and the code and point out what I am doing wrong?

I have to store these 19 values somewhere for further operation on another formula.

Any help or assistance will be highly appreciated.

Thank you.

theta_doa = 0:20:360;
theta_m = [0 60 144 216 288];
k=1:19;
for i=1:19
    j=0;
    c_square = 0;
    for j=1:5
        c_eqn = cosd(theta_doa(i)-theta_m(j)).^2 % internal equation for c_square
        c_square = c_square + c_eqn
    end
    c_square(k)=c_square;
end

Answer 1

[Torsten]

theta_doa = 0:20:360;
theta_m = [0 60 144 216 288];
c_square = zeros(1,numel(theta_doa));
for i = 1:numel(theta_doa)
    for j = 1:numel(theta_m)
        c_square(i) = c_square(i) + (cosd(theta_doa(i)-theta_m(j)))^2 ;
    end
end

[Umer Khalid]

@Torsten thank you so much it worked.