Any Good Learning resource for FFT

Some Good Tutorial and Implementation will helpful to understand Fast Fourier Transform .

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You can refer to this link. It contains different variations of -FFT along with the code snippets.

This link also contains the description of FFT in a very helpful manner.

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you can try this video tutorial-: https://www.youtube.com/watch?v=qrGBpexbT-c
you can also learn from e-maxx http://e-maxx.ru/algo/fft_multiply
(translate it with google translate)

Check This Link, It might be helpful

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Introduction

Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein “Introduction to Algorithms, 3rd Edition”, Chapter 30 - Polynomials and the FFT

Advanced

Jörg Arndt “Matters Computational”

https://www.jjj.de/fxt/

it might be helpful, you can try this video tutorial playlist - https://www.youtube.com/watch?v=zJNtUVBg-tc&list=PLiINLbWPTveq8TuXDjsISg7fPHCrTO0oy