Re: Fourier transform

[Frederic Parrenin <frederic parrenin univ-grenoble-alpes fr>]

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
> > _______________________________________________
> > gnumeric-list mailing list
> > gnumeric-list gnome org
> > https://mail.gnome.org/mailman/listinfo/gnumeric-list
> _______________________________________________
> gnumeric-list mailing list
> gnumeric-list gnome org
> https://mail.gnome.org/mailman/listinfo/gnumeric-list