If I'm correct, Fourier transform lets me know the magnitude and phase of any given frequency in a signal.
I have a sampled signal and I want to compute its Fourier transform (any frequency) without comparing it to the sine/cosine wave of that frequency. So I could create a function checking the wavelength in a signal (also containing other frequencies) to get magnitude of any frequency.
Is it possible? And why?
(I hope my question is not too confused this time)