x = zeros(1,100)
a = 0
j = 1
for i=0:4*pi/100:pi*4-(2*pi/100);
        a = sin(i) * 2
        j
        x(j) = a
        j = j + 1
end

figure;
plot(x)
y = fft(x)
figure;
plot(real(y), 'green')
figure;
plot(imag(y), 'red')