I have some data of periodic nature. The curve seems to be slightly irregular, and it makes sense to consider it as the sum of two or more different sinusoidals.
I'm asking for a source or tools that will allow me to go from a few data points in an irregular periodic signal, to a series of regular sinusoidal which sum will be the irregular signal. I've considered the Fourier transform, but I wouldn't know how to apply it in a case like this since I have no starting function, but a data points (and not many).