Dear all Hi
There is different results in the imaginary parts of Matlab FFT function and my own function. where is the error come from?

her is the code:

clear all
close all
clc

x=[3 2 1 1 2]';
N=length(x);
n=0:N-1;
yt(x); % matlab function
%-----
%this part contains my own function
k=n;
X=[];

for a=1:length(k)
Xk=x'*exp(-j*2*pi*n'*k(a)/N);
X=[X;Xk];
end
%------------

figure(1)

subplot(4,2,1); stem(n,x);ylabel('x(n)')
title('DFT by using Matlab built-in function')
subplot(4,2,3); stem(real(y));ylabel('real X(k)')
subplot(4,2,5); stem(imag(y));ylabel('imag X(k)')
subplot(4,2,7); stem(abs(y));ylabel('abs X(k)')

subplot(4,2,2); stem(n,x,'r');ylabel('x(n)')
title('DFT by using my won function')
subplot(4,2,4); stem(k,real(X),'r');ylabel('real X(k)')
subplot(4,2,6); stem(k,imag(X),'r');ylabel('imag X(k)')
subplot(4,2,8); stem(k,abs(X),'r');ylabel('abs X(k)') Start a New Thread