Hello gurus,
I'm trying to implement FFT on my Qt program in order to find Fundamental frequencies (spectrum) of a time series..
So I have a Qvector<double> and i want to obtain some couples: <double,double> (frequency, amplitude).

Since it is "a bit long" to create the whole library, could you please suggest me some easy one? (and possible some tutorial/explanation on how to use it?)

thanks guys