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added mixed-radix fast Fourier transform

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lifted from my fft project and changed interface:
https://github.com/xdsopl/fft
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Ahmet Inan 2018-08-25 12:22:58 +02:00
commit e149e5edc4
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@ -62,3 +62,7 @@ Implemented [Simple linear regression](https://en.wikipedia.org/wiki/Simple_line
Faster alternative (no Inf/NaN handling) to the std::complex implementation.
### [fft.hh](fft.hh)
Mixed-radix [decimation-in-time](https://en.wikipedia.org/wiki/Cooley%E2%80%93Tukey_FFT_algorithm) [fast Fourier transform](https://en.wikipedia.org/wiki/Fast_Fourier_transform)

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