FFT: Calculate (inverse) DFT using the FFT method

In fftw: Fast FFT and DCT Based on the FFTW Library

Calculate (inverse) DFT using the FFT method

Description

see title

Usage

FFT(x, ..., plan, inverse=FALSE)
IFFT(x, ..., plan, scale=TRUE)
DCT(x, ..., plan, type=1, inverse=FALSE)
IDCT(x, ..., plan, type=1, scale=TRUE)

Arguments

x	(complex) vector to process
...	ignored
plan	FFTW plan, can be missing
inverse	perform inverse transform, provided for fft compatibility.
scale	scale results
type	type of DCT

Author(s)

Olaf Mersmann <[e-mail]>

See Also

planFFT

Examples

n <- 2**16
x <- rnorm(n)
p <- planFFT(n)
y <- FFT(x, plan=p)

Mod(x - IFFT(FFT(x)))

fftw documentation built on March 18, 2022, 6:55 p.m.