Go FFTW Bindings

Go bindings for FFTW (Fastest Fourier Transform in the West).

• FFTW homepage: http://www.fftw.org/
• FFTW docs: http://www.fftw.org/fftw3_doc/

Requirements

• FFTW built as a shared library (--enable-shared).
• cgo enabled (this package uses FFTW via cgo).

Install FFTW

./configure --enable-shared
make
make install

On macOS (Homebrew), FFTW is typically installed under /opt/homebrew.

Install

go get github.com/meko-christian/go-fftw

Packages

• fftw: double-precision (fftw3) bindings.
• fftw32: single-precision (fftw3f) bindings.

Usage

data := fftw.NewArray(64) // Similar to make([]complex128, 64)
forward := fftw.NewPlan(data, data, fftw.Forward, fftw.Estimate)
backward := fftw.NewPlan(data, data, fftw.Backward, fftw.Estimate)
defer forward.Destroy()  // Free FFTW plan resources
defer backward.Destroy() // when no longer needed.

// ... fill in data with something interesting
forward.Execute() // Frequency domain
// ... do something interesting with data
backward.Execute() // Back to time domain (scaled by len(data))

Notes

• These bindings do not mirror FFTW’s C API exactly. For example, array sizes are inferred.
• fftw.Measure may overwrite input buffers during planning. Wrapper helpers use fftw.Estimate.

License

See LICENSE.