Discrete Fourier Transform using MATLAB?

how to write code for 4 point DFT?

Answer 1

[Sufiyan]

Hello,

You can refer to the below code.

% Define the input sequence x[n]
x = [1 2 3 4];
% Compute the DFT coefficients X[k]
X = zeros(1, 4);
for k = 1:4
    for n = 1:4
        X(k) = X(k) + x(n) * exp(-2*pi*1i*(n-1)*(k-1)/4); 
    end
end

disp(X);

  10.0000 + 0.0000i  -2.0000 + 2.0000i  -2.0000 - 0.0000i  -2.0000 - 2.0000i