[R] Fourier Row and spectral analysis

Dieter Menne dieter.menne at menne-biomed.de
Mon Feb 23 08:40:08 CET 2009

Peterko <lanikpeter <at> gmail.com> writes:

> Hello, i need to find in time serie, k=1,2,3...(how if possible) most domain
> frequencies and than smooth original serie by Fourier row  y=mean +
> a1*Cos(2*pi/freq*t)+b1*Sin(2*pi/freq*t)+a2......
> numbers a1,b1 ... i will have from simple regresion, i need only to find k
> msot domain frequensies a than i will have a1,b1,....ak,bk - coeficients.

It is very difficult to understand what you want, mainly the part about the
"simple regression" in Fourier context. For simple filtering/smoothing, check



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