Fast FFT and DCT Based on the FFTW Library

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Documentation for package ‘fftw’ version 1.0-7

Help Pages

DCT Calculate (inverse) DFT using the FFT method
FFT Calculate (inverse) DFT using the FFT method
IDCT Calculate (inverse) DFT using the FFT method
IFFT Calculate (inverse) DFT using the FFT method
planDCT Create FFTW plan
planFFT Create FFTW plan