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==============================================
Discrete Fourier transforms (:mod:`scipy.fft`)
==============================================
.. currentmodule:: scipy.fft
Fast Fourier Transforms (FFTs)
==============================
.. autosummary::
:toctree: generated/
fft - Fast (discrete) Fourier Transform (FFT)
ifft - Inverse FFT
fft2 - 2-D FFT
ifft2 - 2-D inverse FFT
fftn - N-D FFT
ifftn - N-D inverse FFT
rfft - FFT of strictly real-valued sequence
irfft - Inverse of rfft
rfft2 - 2-D FFT of real sequence
irfft2 - Inverse of rfft2
rfftn - N-D FFT of real sequence
irfftn - Inverse of rfftn
hfft - FFT of a Hermitian sequence (real spectrum)
ihfft - Inverse of hfft
hfft2 - 2-D FFT of a Hermitian sequence
ihfft2 - Inverse of hfft2
hfftn - N-D FFT of a Hermitian sequence
ihfftn - Inverse of hfftn
Discrete Sin and Cosine Transforms (DST and DCT)
================================================
.. autosummary::
:toctree: generated/
dct - Discrete cosine transform
idct - Inverse discrete cosine transform
dctn - N-D Discrete cosine transform
idctn - N-D Inverse discrete cosine transform
dst - Discrete sine transform
idst - Inverse discrete sine transform
dstn - N-D Discrete sine transform
idstn - N-D Inverse discrete sine transform
Fast Hankel Transforms
======================
.. autosummary::
:toctree: generated/
fht - Fast Hankel transform
ifht - Inverse of fht
Helper functions
================
.. autosummary::
:toctree: generated/
fftshift - Shift the zero-frequency component to the center of the spectrum
ifftshift - The inverse of `fftshift`
fftfreq - Return the Discrete Fourier Transform sample frequencies
rfftfreq - DFT sample frequencies (for usage with rfft, irfft)
fhtoffset - Compute an optimal offset for the Fast Hankel Transform
next_fast_len - Find the optimal length to zero-pad an FFT for speed
set_workers - Context manager to set default number of workers
get_workers - Get the current default number of workers
Backend control
===============
.. autosummary::
:toctree: generated/
set_backend - Context manager to set the backend within a fixed scope
skip_backend - Context manager to skip a backend within a fixed scope
set_global_backend - Sets the global fft backend
register_backend - Register a backend for permanent use
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