Programming a summation equation

Hello,

I am trying to program this instance

This is my Fourier_Force

using this code:

Z =3;
r = 2;
for j =1:1:size(Fourier_Force,1)
for q = 0:1:Z-1
    Fourier_Force{j,1}  = Fourier_Force{j,1} .* exp(-j*q*((2*pi)/3)*r) % Fourier_force has two values(x and y), thats why I used ".*"
    Fourier_Force{j,1}  = Fourier_Force{j,1} +Fourier_Force{j,1} 
end
end

But it is not giving correct results, I am having problems in the loop and the summation part.

Does anybody know?

Answer 1

[Alan Stevens]

Looks like you are trying to use j as both a loop counter and as sqrt(-1). I assume the latter is what is needed in the exponential function. If so, use i instead.