Re: Fourier transform

[Jean Brefort <jean brefort free fr>]

Hi Frédéric,

Not that I know.

Cheers,
Jean

Le vendredi 08 février 2019 à 18:14 +0100, Frederic Parrenin a écrit :
> Hi Jean,
>
> Do you know if there has been work on the periodogram function after 
> Franck's work?
> I tried the function several times but I never manage to get
> sensible 
> results.
>
> All the best,
>
> Frédéric
>
> Le 08/02/2019 à 17:27, Jean Brefort a écrit :
> > Hello,
> >
> > The Fourier function takes three arguments, but only one is needed.
> > The
> > first argument is a row or column of data to be transformed, the
> > second
> > is a boolean to select the transform type, direct or inverse, and
> > the
> > third is another boolean to select to separate real and imaginary
> > parts
> > of the result (the default is no separation).
> >
> > The function returns an array of one column of complex numbers or
> > two
> > columns of real numbers. Each column has a number of data equal to
> > the
> > power of 2 just above the number of input data (the fft algorithm
> > needs
> > 2^n data, so if you give, let's say 100 numbers, 28 0s will be
> > appended).
> >
> > As for all array functions, you need to select the output area,
> > type
> > the function and its arguments, and validate using
> > Ctrl+Shift+Enter?
> >
> > Hope this helps,
> > Jean
> >
> > Le vendredi 08 février 2019 à 14:19 +0000, Mark Lytle a écrit :
> > > Hello,
> > >
> > > Would like to use the Time Series features of Gnumeric, but the
> > > online manual doesn't really show syntax.  I did a search on the
> > > Gnumeric list looking for an example in use, but all I see are
> > > esoteric discussions, no examples.
> > >
> > > Is there another reference with examples of even one of the time
> > > series features in use? If I could see one, I could figure out
> > > the
> > > rest.
> > >
> > > Thanks,
> > > Mark Lytle
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