[OT] Fourier analysis question using Gnumeric

[E K]

That is right. Fourier series assumes that any waveform (or any time series) can be represented by a series of pure sine and cosine waves of different amplitude. It does not matter whether the wave form is periodic, semi-periodic or just one spike.
EK

--- On Thu, 9/27/12, William Park <opengeometry-FFYn/CNdgSA at public.gmane.org> wrote:

From: William Park <opengeometry-FFYn/CNdgSA at public.gmane.org>
Subject: Re: [TLUG]: [OT] Fourier analysis question using Gnumeric
To: tlug-lxSQFCZeNF4 at public.gmane.org
Received: Thursday, September 27, 2012, 9:59 AM

On Wed, Sep 26, 2012 at 11:06:25PM -0400, Walter Dnes wrote:
> On Wed, Sep 26, 2012 at 01:20:16AM -0400, William Park wrote
> 
> > What you do want at the end?  Real signal is time-based, so frequency
> > spectrum is just the mean, not the end.  
> 
>   I'm interested in seeing if there are any repeating cycles in the
> data.

Then, what you want is "correlaton", more exactly "auto-correlation"
since I'm assuming you have only one signal.  If there were repeating
signal with a lag time, then you'll see a "spike" at that lag time in
auto-correlation.
-- 
William
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