fft, ifft
Module: fftpack
J1a2: verified
Derivatives / callbacks: not applicable
Complex one-dimensional forward and backward Fourier transforms.
Pinned source: src/fftpack.f90
Author examples/tests: test/test_fftpack_fft.f90
Repository owner: fortran-lang
fftpack
Fast Fourier, sine, and cosine transforms.
Repository · Pinned source (0fffe7c05a91) · Try in playground · Checked package example
GAMS classifications
About this package
- Category
- Transforms
- License
- Public Domain
Topics: cosine-transforms, fast-fourier-transform, fft, fft-library, fftpack, fortran-library, fortran-package-manager, fourier-transforms, sine-transforms
Package dependencies
Resolved GitHub repositories used by the verified playground build, combining direct and indirect dependencies. This list does not describe internal module dependencies or native system libraries.
Required by this build
No additional GitHub package dependencies were recorded for this verified build.
Build record verified 2026-10-27.
Used by (0 selected packages)
No other selected build records this repository as a dependency. This is not a measure of usage outside the catalog.
Reviewed procedures
These mappings have pinned source evidence. A checked package example may exercise only some of them; source review is not a numerical benchmark.
dct(type=2), idct(type=2)
Module: fftpack
J1a3: verified
Derivatives / callbacks: not applicable
One-dimensional DCT-II and its inverse. This FFTPACK API uses a forward factor of 4 and an unnormalized inverse; divide the composition by 4*N.
Pinned source: src/fftpack_dct.f90
Author examples/tests: test/test_fftpack_dct.f90