# Re: Time domain to frequency domain with FFT from GSL

**URL:** <https://www.ruby-forum.com/t/re-time-domain-to-frequency-domain-with-fft-from-gsl/95490>\
**Category:** Ruby\
**Created:** [June 3, 2006, 9:56am UTC](https://www.ruby-forum.com/t/re-time-domain-to-frequency-domain-with-fft-from-gsl/95490 "2006-06-03T09:56:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\
**Post date:** [June 3, 2006, 9:56am UTC](https://www.ruby-forum.com/t/re-time-domain-to-frequency-domain-with-fft-from-gsl/95490/1 "2006-06-03T09:56:05Z")

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Dear Alex,

Good and fairly concise explanations of what FFT is and what mistakes  
can be made in it is given in chapter 12 of the “Numerical Recipes in  
C”.  
You can find it here:

\_[http://www.library.cornell.edu/nr/bookcpdf.html\_](http://www.library.cornell.edu/nr/bookcpdf.html_)  
([http://www.library.cornell.edu/nr/bookcpdf.html](http://www.library.cornell.edu/nr/bookcpdf.html))

Best regards,

Axel