Re: Fourier transform

I now have both the FFT and the interpolation function working, yes, it was because I hadn't activated all of the plug-ins, that was the trick.

Thank you Frédéric and Jean
--------------------------------------------
On Fri, 2/8/19, Frederic Parrenin <[email protected]> wrote:

 Subject: Re: Fourier transform
 To: "Jean Brefort" <[email protected]>, "Mark Lytle" <[email protected]>, [email protected]
 Date: Friday, February 8, 2019, 11:14 AM
 
 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
 >> [email protected]
 >> https://mail.gnome.org/mailman/listinfo/gnumeric-list
 >
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