fast Fourier transform

Projects Programming
1

there is fast Fourier transform library in Arduino and if it is available how I can use it, please?

2

What did Google tell you?

3

It's also listed in the official Arduino libraries, under the heading "Audio and Waveforms:"

4

There are many FFT implementations for Arduino.

5

jremington:
There are many FFT implementations for Arduino.

... and all of them come with instructions...