Re: FFT in ROOT?

From: Faouzi Attallah (attallah@clri6a.gsi.de)
Date: Tue Dec 08 1998 - 10:52:00 MET


On Tue, 8 Dec 1998, Nick van Eijndhoven wrote:

> Florian Schopper wrote:
> > 
> > Hey Rooters,
> > 
> > just a very short question:
> > Is Fast-Fourier-Tranform or convolution implemented in root, or has anyone
> > a c++ library which can be easily linked?
> > 
> >      thanks,
> >             Florian Schopper
> > 
> 
> Hi Florian,
> Since I use ROOT also for my teaching I might soon need fast
> Fourier transforms in C++.
> Currently I am not aware of existing stuff, so I have in mind
> to make my own ones (based on Numerical recipes) just like
> I recently did for the Chi2 probab. function and the Gamma
> functions etc...
> I can't guarantee any timescale, but my intention is to work
> on it during the coming Xmass holidays.
> Of course if anyone has already something, I would be interested
> to know. 
> -- 
> 
>                                               Cheers,
> 
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> 
> 
> *----------------------------------------------------------------------*
>  Dr. Nick van Eijndhoven                Department of Subatomic Physics
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> 

I am using FFT routines I developped in C/C++ from several sources.
They were tested and checked. 
Let me just comment them and you will get them attached to my next
mail.

Faouzi 

PS: some bugs exist in the C-version of the Numerical recipes



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