# FFTPACK

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FFTPACK Developer Paul N. Swarztrauber Release April 1985 Written in Fortran Type Numerical software License public domain Website www.netlib.org/fftpack/

**FFTPACK** is a package of [Fortran](/source/Fortran) [subroutines](/source/Subroutine) for the [fast Fourier transform](/source/Fast_Fourier_transform). It includes [complex](/source/Complex_number), [real](/source/Real_number), [sine](/source/Sine), [cosine](/source/Cosine), and quarter-wave transforms. It was developed by Paul Swarztrauber of the [National Center for Atmospheric Research](/source/National_Center_for_Atmospheric_Research), and is included in the general-purpose mathematical library [SLATEC](/source/SLATEC).

Much of the package is also available in [C](/source/C_(programming_language)) and [Java](/source/Java_(programming_language)) translations.

## See also

- [Fastest Fourier Transform in the West](/source/Fastest_Fourier_Transform_in_the_West) (FFTW)

- [LAPACK](/source/LAPACK)

- [List of open-source mathematical libraries](/source/List_of_free_and_open-source_software_packages#Mathematical_libraries)

## References

- [Official website](http://www.netlib.org/fftpack/)

- Swarztrauber, P.N. (1982). ["Vectorizing the FFTs"](https://archive.org/details/parallelcomputat0000unse/page/51). In Rodrigue, Garry (ed.). *Parallel Computations*. [Academic Press](/source/Academic_Press). pp. [51–83](https://archive.org/details/parallelcomputat0000unse/page/51). [ISBN](/source/ISBN_(identifier)) [978-0-12-592101-5](https://en.wikipedia.org/wiki/Special:BookSources/978-0-12-592101-5).

- Wendykie, Piotr. ["JTransforms"](https://sites.google.com/site/piotrwendykier/software/jtransforms). *Java*. Open source. Multithreaded FFT library

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