power_spectrum This example computes the power spectrum of a signal using fftw. Dependencies fftw Building make Verification with octave: x = fft([3 12 23 12 1 8 19 16 5 5 12 22 12 0 8 16]); round((real(x).^2+imag(x).^2))(1:9) 30276 35 249 1441 3362 827 99 16 64