fft Class Reference

Fast fourier transform derived from the Numerical Recipes in C routine. More...

Public Types

enum  transformDirection { FORWARD_TRANSFORM = 1, REVERSE_TRANSFORM = -1 }
 

Static Public Member Functions

static void transform (complexField &field, const labelList &nn, transformDirection fftDirection)
 
static tmp< complexFieldforwardTransform (const tmp< complexField > &field, const labelList &nn)
 
static tmp< complexFieldreverseTransform (const tmp< complexField > &field, const labelList &nn)
 
static tmp< complexVectorFieldforwardTransform (const tmp< complexVectorField > &field, const labelList &nn)
 
static tmp< complexVectorFieldreverseTransform (const tmp< complexVectorField > &field, const labelList &nn)
 

Detailed Description

Fast fourier transform derived from the Numerical Recipes in C routine.

The complex transform field is returned in the field supplied. The direction of transform is supplied as an argument (1 = forward, -1 = reverse). The dimensionality and organisation of the array of values in space is supplied in the nn indexing array.

Source files

Definition at line 51 of file fft.H.

Member Enumeration Documentation

◆ transformDirection

Enumerator
FORWARD_TRANSFORM 
REVERSE_TRANSFORM 

Definition at line 56 of file fft.H.

Member Function Documentation

◆ transform()

void transform ( complexField field,
const labelList nn,
transformDirection  fftDirection 
)
static

◆ forwardTransform() [1/2]

tmp< complexField > forwardTransform ( const tmp< complexField > &  field,
const labelList nn 
)
static

Definition at line 187 of file fft.C.

References tmp< T >::clear(), tmp< T >::ref(), fft::reverseTransform(), and Foam::transform().

Referenced by Foam::calcEk(), fft::reverseTransform(), and fft::transform().

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◆ reverseTransform() [1/2]

tmp< complexField > reverseTransform ( const tmp< complexField > &  field,
const labelList nn 
)
static

Definition at line 203 of file fft.C.

References tmp< T >::clear(), fft::forwardTransform(), tmp< T >::ref(), and Foam::transform().

Referenced by fft::forwardTransform(), noiseFFT::Pf(), and turbGen::U().

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◆ forwardTransform() [2/2]

tmp< complexVectorField > forwardTransform ( const tmp< complexVectorField > &  field,
const labelList nn 
)
static

◆ reverseTransform() [2/2]

tmp< complexVectorField > reverseTransform ( const tmp< complexVectorField > &  field,
const labelList nn 
)
static

Definition at line 248 of file fft.C.

References tmp< T >::clear(), Foam::component(), VectorSpace< Vector< scalar >, scalar, 3 >::nComponents, tmp< T >::ref(), and Field< Type >::replace().

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The documentation for this class was generated from the following files: