fft

Documentation

Index

• Constants
• func NextPowerOfTwo(value uint64) (uint64, uint32)
• func Shift(vec []complex128, inverse bool)
• func ZeroComplex(buffer []complex128)
• func ZeroFloat(buffer []float64)
• type FourierTransform
  • func CreateFourierTransform() FourierTransform

Constants

const (
	SCALING_DEFAULT = iota
	SCALING_ORTHONORMAL
	MODE_STANDARD
	MODE_INPLACE
)

* Global constants.

const (
	MATH_INV_SQRT_2   = 1.0 / math.Sqrt2
	MATH_MINUS_TWO_PI = -2.0 * math.Pi
)

* Mathematical constants

Functions

func NextPowerOfTwo

func NextPowerOfTwo(value uint64) (uint64, uint32)

* Find the next higher power of two. * * If value is already a power of two, the same value is returned.

func Shift

func Shift(vec []complex128, inverse bool)

* Shift negative frequencies to lower indices than the DC component or invert the * shifting process.

func ZeroComplex

func ZeroComplex(buffer []complex128)

* Write zeroes to a complex-valued buffer.

func ZeroFloat

func ZeroFloat(buffer []float64)

* Write zeroes to a floating-point buffer.

Types

type FourierTransform

type FourierTransform interface {
	Fourier(vec []complex128, scaling int, mode int) []complex128
	InverseFourier(vec []complex128, scaling int, mode int) []complex128
	RealFourier(in []float64, out []complex128, scaling int) error
	RealInverseFourier(in []complex128, out []float64, scaling int) error
}

* A Fourier transform. * * A single transform is not safe for concurrent use!

func CreateFourierTransform

func CreateFourierTransform() FourierTransform

* Creates a Fourier transform.