data1 = [1.0 0.0 0.0 0.0  0.0 0.0 0.0 0.0]
res1 = fft(data1)

data2 = [1.0 1.0 0.0 0.0  0.0 0.0 0.0 0.0]
res2 = fft(data2)

data3 = [1.0 1.0 i i  0.0 0.0 0.0 0.0]
res3 = fft(data3)

data4 = [1.0+i 1.0+i 1.0+i 1.0+i  0.0 0.0 0.0 0.0]
res4 = fft(data4)