DTFT in matlab

dtft.m

function [ X ] = dtft( x, n, w )
% [X] = dtft(x, n, w)
% X = DTFT values computed at w frequencies
% x = finite duration sequence over n
% n = sample position vector
% w = frequency location vector

temp = w' * n;
temp = -1i * temp;

e = exp(temp);

X = e * x';

end

dtft_test.m

w = -2*pi:0.01:2*pi;
n = 0:1:100;
w0 = 2;
x = exp(n .* (1i*w0)); % x = exp(jw0n)

X = dtft(x, n, w);

subplot(2,1,1); plot(n, x); title('signal = exp(jw0n)');
subplot(2,1,2); plot(w, X); title('DTFT');

gistfile1.txt

What I wanted to achieve in the implementation of DTFT was not using `for` loops.

Looking at the example it must be clear how to use this function.

help me to solve this problem...