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Groups > comp.graphics.apps.gnuplot > #3549

Re: Need some help -- plot fast fourier transform

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On Friday, November 20, 2015 at 11:56:31 PM UTC-5, daku...@gmail.com wrote:
> Could some Gnuplot guru please provide any simple 
> example script for plotting FFT(fast fourier 
> transform). Currently I am just able to create 
> scatter plots of FFT output, but I would much
> rather have the simple line graphs. All hints/
> suggestions would be greatly appreciated - thans 
> in advance for your help.

Assuming you have two columns, real and complex, you might looking for something like

plot 'myfftfile' using 0:($1**2+$2**2)

That will plot the amplitude versus bin number

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Need some help -- plot fast fourier transform dakupoto@gmail.com - 2015-11-20 20:56 -0800
  Re: Need some help -- plot fast fourier transform Karl-Friedrich Ratzsch <mail.kfr@gmx.net> - 2015-11-21 11:43 +0100
    Re: Need some help -- plot fast fourier transform dakupoto@gmail.com - 2015-11-21 19:13 -0800
      Re: Need some help -- plot fast fourier transform Richard Owlett <rowlett@cloud85.net> - 2015-11-22 04:58 -0600
      Re: Need some help -- plot fast fourier transform Thomas Wagner <thomas.wagner.marl@freenet.de> - 2015-11-25 00:51 +0100
      Re: Need some help -- plot fast fourier transform Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2015-11-25 01:25 +0100
      Re: Need some help -- plot fast fourier transform drmcnelson@gmail.com - 2017-01-28 17:47 -0800
        Re: Need some help -- plot fast fourier transform John Edwards <johned0@gmail.com> - 2017-01-31 04:18 -0800
  Re: Need some help -- plot fast fourier transform Richard Owlett <rowlett@cloud85.net> - 2015-11-21 10:07 -0600
  Re: Need some help -- plot fast fourier transform drmcnelson@gmail.com - 2017-01-28 17:08 -0800

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